diff --git a/AGENTS.md b/AGENTS.md
index e7e279812..d73636c7d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -11,7 +11,8 @@ images: the BidCoS-RF daemon `rfd`, the BidCoS-Wired daemon `hs485d`, their
 libraries (`libXmlRpc`, `libelvutils`, `libhsscomm`, `libUnifiedLanComm`, …),
 `multimacd`, the Tcl modules, the WebUI, device types and firmware. The
 closed-source components (ReGaHss, the HmIP server) are shipped as binaries
-only; `src/ReGaHss/` and `src/hmipserver/` contain just a `README.md`.
+only; `src/ReGaHss/` and `src/hmipserver/` contain just a `README.md` and
+their changelog.
 
 OS-level changes (Buildroot, kernel, init scripts such as `S61rfd`, packages)
 belong in [OpenCCU/OpenCCU](https://github.com/OpenCCU/OpenCCU), which picks up
@@ -69,13 +70,18 @@ what you could and could not test.
   of the OpenCCU-Base libraries whose functions it calls, read from the loaded
   libraries (check with `nm -D --undefined-only`, not only the link line).
   A program links only the OpenCCU-Base libraries whose functions it calls.
-- **Daemon changelogs:** a pull request with a user-visible change to `rfd` or
-  `hs485d` (including changes of the libraries they are built with) adds an
-  entry to `src/<daemon>/CHANGELOG.md` under `## Unreleased` (create the
-  heading at the top if it is missing), in the style of the existing entries:
-  what was wrong or what is new, written for users, with links to the pull
-  request and the fixed issue. A version bump renames `## Unreleased` to
-  `## <version> (<date>)`.
+- **Component changelogs:** every component under `src/` (except `webui`) has
+  a `CHANGELOG.md`. The one of the closed-source `ReGaHss` (`ChangeLog` up to
+  R1.00.0388.0267) comes with its binaries from the Release workflow of the
+  ReGaHss repository and is not edited here. A pull request with a
+  user-visible change adds an entry under `## Unreleased` (create the heading
+  at the top if it is missing) to the changelog of every component it
+  changes, in the style of the existing entries: what was wrong or what is
+  new, written for users, with links to the pull request and the fixed
+  issue. A change of a library goes into the library's changelog, not into
+  those of the programs using it. A version bump renames `## Unreleased` to
+  `## <version> (<date>)`; for `devicetypes` and `hmipserver`, which have no
+  version of their own, the OpenCCU-Base release takes its place.
 - WebUI, Tcl and ReGa code must escape every user-controlled value.
 - Changes to the closed-source binaries come from eQ-3; do not patch them.
 
diff --git a/README.md b/README.md
index 46004619b..631c5f2bc 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ This repository is used as the common base package that delivers:
 ## Repository layout (high level)
 
 - `src/` - source code and module-local build logic (Makefiles) for core components.
-  Closed-source components (`src/ReGaHss/`, `src/hmipserver/`) only contain a `README.md` (and a `ChangeLog`) there, their binaries are part of `bin/` and `opt/`.
+  Closed-source components (`src/ReGaHss/`, `src/hmipserver/`) only contain a `README.md` and their `CHANGELOG.md` there, their binaries are part of `bin/` and `opt/`.
 - `bin/` - architecture-specific executable binaries and helper/startup scripts.
 - `www/` - WebUI and Tcl-based runtime resources.
 - `etc/` - configuration templates used during deployment/runtime setup.
diff --git a/src/ReGaHss/README.md b/src/ReGaHss/README.md
index f64a046a9..dad00ca66 100644
--- a/src/ReGaHss/README.md
+++ b/src/ReGaHss/README.md
@@ -2,12 +2,12 @@
 
 `ReGaHss` ("Residential Gateway") is the logic engine of the CCU. It provides the device and system variable database, the program logic, the HomeMatic script interpreter and the backend of the WebUI.
 
-ReGaHss is **closed source**: its source code cannot be published and is therefore not part of OpenCCU-Base. Only the ReGaHss binaries and its ChangeLog are provided here.
+ReGaHss is **closed source**: its source code cannot be published and is therefore not part of OpenCCU-Base. Only the ReGaHss binaries and its changelog are provided here.
 
 ## Files
 
 - `bin/<platform>/ReGaHss` - ReGaHss binaries for all supported platforms (`aarch64-linux-gnu`, `arm-linux-gnueabihf`, `i686-linux-gnu`, `x86_64-linux-gnu`).
-- `src/ReGaHss/ChangeLog` - changes of every ReGaHss release. The topmost section describes the release of the binaries in `bin/<platform>/ReGaHss`; both are always updated together.
+- `src/ReGaHss/CHANGELOG.md` (`src/ReGaHss/ChangeLog` up to R1.00.0388.0267) - changes of every ReGaHss release, in the format of the other component changelogs. The topmost section describes the release of the binaries in `bin/<platform>/ReGaHss`; both are always updated together.
 
 The parts of ReGaHss that are available as source code are maintained in OpenCCU-Base:
 
diff --git a/src/SetInterfaceClock/CHANGELOG.md b/src/SetInterfaceClock/CHANGELOG.md
new file mode 100644
index 000000000..c02b654ac
--- /dev/null
+++ b/src/SetInterfaceClock/CHANGELOG.md
@@ -0,0 +1,19 @@
+# SetInterfaceClock ChangeLog
+
+Changes of `SetInterfaceClock`, the tool that sets the clock of the radio
+interfaces. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `-v` / `--version`
+  prints it together with the versions of libXmlRpc and libelvutils.
+  SetInterfaceClock no longer links libhsscomm and libxmlparser, which it
+  does not use. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/bcm2835_raw_uart/CHANGELOG.md b/src/bcm2835_raw_uart/CHANGELOG.md
new file mode 100644
index 000000000..98402defa
--- /dev/null
+++ b/src/bcm2835_raw_uart/CHANGELOG.md
@@ -0,0 +1,16 @@
+# bcm2835_raw_uart ChangeLog
+
+Changes of `bcm2835_raw_uart`, the kernel module for the UART of the radio
+module on the Raspberry Pi. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`MODULE_VERSION`).
+
+## 1.12
+
+* version at the start of this changelog.
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/crypttool/CHANGELOG.md b/src/crypttool/CHANGELOG.md
new file mode 100644
index 000000000..6cd1c4a7c
--- /dev/null
+++ b/src/crypttool/CHANGELOG.md
@@ -0,0 +1,18 @@
+# crypttool ChangeLog
+
+Changes of `crypttool`, the tool for the AES keys of the BidCos devices.
+Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `--version` prints it
+  together with the version of libelvutils (`-v` stays "validate").
+  [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/devicetypes/CHANGELOG.md b/src/devicetypes/CHANGELOG.md
new file mode 100644
index 000000000..2e3691443
--- /dev/null
+++ b/src/devicetypes/CHANGELOG.md
@@ -0,0 +1,21 @@
+# devicetypes ChangeLog
+
+Changes of `devicetypes`, the device descriptions of the BidCos-RF and
+BidCos-Wired devices. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+OpenCCU-Base release they are part of when it is published.
+
+## Unreleased
+
+* fix the limits of `SET_TEMPERATURE` (4.5 to 30.5 °C instead of 5.0 to
+  30.0 °C) of the HM-CC-RT-DN-BoM, as in the HM-CC-RT-DN, and of the virtual
+  heating group HM-CC-VG-1: setting 30.5 °C (on) or 4.5 °C (off) caused
+  warnings in integrations such as ioBroker or Home Assistant. [#221](https://github.com/OpenCCU/OpenCCU-Base/pull/221)
+* fix the long-press action of the CFM-TW LED profile writing the
+  short-press register (`LONG_ACT_TYPE` at 0xA4 instead of 0x24). [#63](https://github.com/OpenCCU/OpenCCU-Base/pull/63)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/eq3_char_loop/CHANGELOG.md b/src/eq3_char_loop/CHANGELOG.md
new file mode 100644
index 000000000..2b1810c50
--- /dev/null
+++ b/src/eq3_char_loop/CHANGELOG.md
@@ -0,0 +1,25 @@
+# eq3_char_loop ChangeLog
+
+Changes of `eq3_char_loop`, the kernel module that provides the device nodes
+through which multimacd shares the radio module. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`MODULE_VERSION`).
+
+## 1.6 (2026-10-03)
+
+* hang up the connections of rfd and the HmIP server when multimacd (the
+  master) exits: they got attached to the next multimacd without it knowing,
+  wrote into a buffer nobody read and could block for ever, even against
+  SIGKILL. Such a connection now fails with `ENODEV`/`POLLHUP` until it is
+  opened again. [#112](https://github.com/OpenCCU/OpenCCU-Base/pull/112)
+
+## 1.5 (2026-09-05)
+
+* update to version 1.5, including compatibility with Linux 6.
+  [#22](https://github.com/OpenCCU/OpenCCU-Base/pull/22)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/eq3configcmd/CHANGELOG.md b/src/eq3configcmd/CHANGELOG.md
new file mode 100644
index 000000000..d78bbea6c
--- /dev/null
+++ b/src/eq3configcmd/CHANGELOG.md
@@ -0,0 +1,17 @@
+# eq3configcmd ChangeLog
+
+Changes of `eq3configcmd`, the command line tool for the configuration of
+LAN gateways and radio modules. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `-v` / `--version`
+  prints it together with the version of libeq3config. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/eq3configd/CHANGELOG.md b/src/eq3configd/CHANGELOG.md
new file mode 100644
index 000000000..2d0f3743c
--- /dev/null
+++ b/src/eq3configd/CHANGELOG.md
@@ -0,0 +1,18 @@
+# eq3configd ChangeLog
+
+Changes of `eq3configd`, the daemon that answers the network configuration
+protocol of eQ-3's tools (e.g. the finder of LAN gateways). Newest version
+first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `-v` / `--version`
+  prints it together with the version of libelvutils. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/hmipserver/CHANGELOG.md b/src/hmipserver/CHANGELOG.md
new file mode 100644
index 000000000..9e324caec
--- /dev/null
+++ b/src/hmipserver/CHANGELOG.md
@@ -0,0 +1,18 @@
+# hmipserver ChangeLog
+
+Changes of `hmipserver`, the HmIP server (`HMIPServer.jar`) of eQ-3, which
+is only provided as a binary. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+OpenCCU-Base release they are part of when it is published.
+
+## Unreleased
+
+* update `HMIPServer.jar` to the build of 2026-10-08 (build 5936, version
+  1.5.1-SNAPSHOT) from eQ-3: avoid a security counter update with invalid
+  values.
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/hs485d/CHANGELOG.md b/src/hs485d/CHANGELOG.md
index a50bdbb8d..345326ffb 100644
--- a/src/hs485d/CHANGELOG.md
+++ b/src/hs485d/CHANGELOG.md
@@ -1,9 +1,9 @@
 # hs485d ChangeLog
 
-Changes of `hs485d`, the BidCos-Wired interface process, including the
-changes of the libraries it is built with (libXmlRpc, libhsscomm,
-libelvutils, libLanDeviceUtils, libUnifiedLanComm, libxmlparser). Newest
-version first.
+Changes of `hs485d`, the BidCos-Wired interface process. Newest version
+first. Up to 1.4.0 the entries include the changes of the libraries it is
+built with; since then these are in the changelogs of the libraries
+(`src/lib*/CHANGELOG.md`).
 
 Changes not yet released are collected under `Unreleased` and get the
 version and date with the next version bump (`version.sh` and
diff --git a/src/hs485dLoader/CHANGELOG.md b/src/hs485dLoader/CHANGELOG.md
new file mode 100644
index 000000000..ce41a2f8a
--- /dev/null
+++ b/src/hs485dLoader/CHANGELOG.md
@@ -0,0 +1,18 @@
+# hs485dLoader ChangeLog
+
+Changes of `hs485dLoader`, the loader that writes the Wired interfaces into
+`InterfacesList.xml` and starts hs485d. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `-v` / `--version`
+  prints it together with the version of libelvutils. hs485dLoader no longer
+  links libxmlparser, which it does not use. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/hss_led/CHANGELOG.md b/src/hss_led/CHANGELOG.md
new file mode 100644
index 000000000..fa018abd3
--- /dev/null
+++ b/src/hss_led/CHANGELOG.md
@@ -0,0 +1,30 @@
+# hss_led ChangeLog
+
+Changes of `hss_led`, the LED controller and status monitor of the CCU
+(`hss_ledctl` is its client invocation). Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 2.3.0 (2026-11-02)
+
+* first version kept in `version.sh` (the version was a fixed "2.3" before).
+  `--version` / `-V` also prints the versions of the libraries it uses
+  (libXmlRpc, libelvutils); hss_led no longer links libxmlparser, which it
+  does not use. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the UDP channel no longer working once its socket got a file
+  descriptor of 1024 or more: it waits with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+* report an active `/etc/config/disableLED` lock in the radio LED status
+  (`disabled=0|1` in the RPI-RF-MOD status reply) and mention it in the
+  `hss_ledctl` help: with the lock, the LED stays off, manual overrides
+  included. ([#203](https://github.com/OpenCCU/OpenCCU-Base/pull/203), refs
+  [OpenCCU/OpenCCU#4443](https://github.com/OpenCCU/OpenCCU/issues/4443))
+* run the LED controller and the status calculation in one process, with
+  `hss_ledctl` as its client invocation, explicit LED-class target selection
+  and a minimal recovery build of the same controller. [#59](https://github.com/OpenCCU/OpenCCU-Base/pull/59)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libLanDeviceUtils/CHANGELOG.md b/src/libLanDeviceUtils/CHANGELOG.md
new file mode 100644
index 000000000..d70324eb0
--- /dev/null
+++ b/src/libLanDeviceUtils/CHANGELOG.md
@@ -0,0 +1,20 @@
+# libLanDeviceUtils ChangeLog
+
+Changes of `libLanDeviceUtils`, the library for the LAN devices (gateways)
+of rfd, hs485d and eq3configcmd. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`), returned by
+  `landeviceutils_version()`. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the UDP datagram sender failing once a descriptor was 1024 or more: it
+  waits with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libUnifiedLanComm/CHANGELOG.md b/src/libUnifiedLanComm/CHANGELOG.md
new file mode 100644
index 000000000..3c6488bbb
--- /dev/null
+++ b/src/libUnifiedLanComm/CHANGELOG.md
@@ -0,0 +1,17 @@
+# libUnifiedLanComm ChangeLog
+
+Changes of `libUnifiedLanComm`, the library for the connection to the LAN
+gateways (HM-LGW, HMW-LGW) of rfd and hs485d. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`), returned by
+  `unifiedlancomm_version()`. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libXmlRpc/CHANGELOG.md b/src/libXmlRpc/CHANGELOG.md
new file mode 100644
index 000000000..a50cdc4d9
--- /dev/null
+++ b/src/libXmlRpc/CHANGELOG.md
@@ -0,0 +1,48 @@
+# libXmlRpc ChangeLog
+
+Changes of `libXmlRpc`, the XML-RPC and BIN-RPC library of rfd, hs485d,
+hss_led, SetInterfaceClock, tclrpc and ReGaHss. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`XMLRPC_VERSION_NUMBER` in
+`src/xmlrpc_version.h`).
+
+## Unreleased
+
+* add `xmlrpc_version()`, which returns the version of the loaded library
+  (`XMLRPC_VERSION` still reads "XMLRPC++ 0.12"). [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the RPC server no longer answering, or the process aborting, once a
+  socket got a file descriptor of 1024 or more: the dispatcher waits with
+  `poll()` instead of `select()`. ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+* an interrupted `select()` (e.g. by a stop signal) is no longer logged as an
+  error. [#281](https://github.com/OpenCCU/OpenCCU-Base/pull/281)
+* fix an RPC method reading freed memory when a call has fewer arguments than
+  the method reads: room for 8 more arguments is reserved before every call,
+  so missing arguments can no longer move earlier ones.
+  ([#271](https://github.com/OpenCCU/OpenCCU-Base/pull/271), fixes [#167](https://github.com/OpenCCU/OpenCCU-Base/issues/167))
+
+## 0.12 (2026-10-13)
+
+* fix a crash (SIGSEGV) of the server on a deeply nested value, reachable
+  with a single unauthenticated request: arrays and structs are parsed up to
+  64 levels deep, a deeper value is rejected. [#189](https://github.com/OpenCCU/OpenCCU-Base/pull/189)
+* fix out-of-bounds reads of the BIN-RPC deserializer on invalid length
+  fields: such a request is rejected instead of crashing the server.
+  [#140](https://github.com/OpenCCU/OpenCCU-Base/pull/140)
+
+## 0.11 (2026-10-07)
+
+* fix a crash (SIGSEGV) of the server on a `system.multicall` nested in
+  another one: a nested `system.multicall` is rejected with a fault, as the
+  specification requires. [#138](https://github.com/OpenCCU/OpenCCU-Base/pull/138)
+
+## 0.10 (2026-09-07)
+
+* fix a crash of the RPC client when a reconnect failed: the connection was
+  removed twice from the dispatcher.
+  ([#27](https://github.com/OpenCCU/OpenCCU-Base/pull/27), fixes [OpenCCU/OpenCCU#4138](https://github.com/OpenCCU/OpenCCU/issues/4138))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libelvutils/CHANGELOG.md b/src/libelvutils/CHANGELOG.md
new file mode 100644
index 000000000..4f8178239
--- /dev/null
+++ b/src/libelvutils/CHANGELOG.md
@@ -0,0 +1,28 @@
+# libelvutils ChangeLog
+
+Changes of `libelvutils`, the utility library (logging, configuration files,
+threads, hex files) of the OpenCCU-Base programs. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`), returned by
+  `elvutils_version()`. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the multicast sender failing once a descriptor was 1024 or more: it
+  waits with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+* fix the thread of an actor (the event dispatcher of each receiver in rfd
+  and hs485d) being joined twice, and a hang when an actor was stopped right
+  after it was started. ([#269](https://github.com/OpenCCU/OpenCCU-Base/pull/269), fixes [#161](https://github.com/OpenCCU/OpenCCU-Base/issues/161))
+* refuse a hex file without data (e.g. an empty or truncated firmware file)
+  instead of crashing the reader. ([#267](https://github.com/OpenCCU/OpenCCU-Base/pull/267), fixes [#176](https://github.com/OpenCCU/OpenCCU-Base/issues/176))
+* read configuration lines of any length: a line of 256 characters or more
+  made the programs hang at start at 100 % CPU, and a read error is reported.
+  ([#263](https://github.com/OpenCCU/OpenCCU-Base/pull/263), fixes [#177](https://github.com/OpenCCU/OpenCCU-Base/issues/177))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libeq3config/CHANGELOG.md b/src/libeq3config/CHANGELOG.md
new file mode 100644
index 000000000..46c5f6d39
--- /dev/null
+++ b/src/libeq3config/CHANGELOG.md
@@ -0,0 +1,20 @@
+# libeq3config ChangeLog
+
+Changes of `libeq3config`, the library behind eq3configcmd. Newest version
+first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`), returned by
+  `eq3config_version()`. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the serial port wrapper failing once a descriptor was 1024 or more: it
+  waits with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libhsscomm/CHANGELOG.md b/src/libhsscomm/CHANGELOG.md
new file mode 100644
index 000000000..83b2a2e6d
--- /dev/null
+++ b/src/libhsscomm/CHANGELOG.md
@@ -0,0 +1,31 @@
+# libhsscomm ChangeLog
+
+Changes of `libhsscomm`, the library with the common device and RPC logic of
+rfd and hs485d. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`), returned by
+  `hsscomm_version()`. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix the TCP and serial port wrappers failing once a descriptor was 1024 or
+  more: they wait with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+* send `replaceDevice` at the init of a receiver only to that receiver, and do
+  not report the channels of a replaced device separately.
+  ([#283](https://github.com/OpenCCU/OpenCCU-Base/pull/283), fixes [#169](https://github.com/OpenCCU/OpenCCU-Base/issues/169))
+* fix a wrong conversion of long strings to unsigned integers (used by the
+  HM-OU-LED16 at channel set-up). ([#268](https://github.com/OpenCCU/OpenCCU-Base/pull/268), fixes [#168](https://github.com/OpenCCU/OpenCCU-Base/issues/168))
+* add `UnregisterInternalValueEvents()`, so a channel can remove its event
+  registration before it is deleted. [#257](https://github.com/OpenCCU/OpenCCU-Base/pull/257)
+* bound the init callbacks and the asynchronous callbacks to a receiver with
+  a 30 s timeout: a receiver that never answers no longer freezes the daemon
+  or makes it grow by a thread and a socket per callback.
+  ([#207](https://github.com/OpenCCU/OpenCCU-Base/pull/207), fixes [#170](https://github.com/OpenCCU/OpenCCU-Base/issues/170); [#208](https://github.com/OpenCCU/OpenCCU-Base/pull/208), fixes [#171](https://github.com/OpenCCU/OpenCCU-Base/issues/171))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/libxmlparser/CHANGELOG.md b/src/libxmlparser/CHANGELOG.md
new file mode 100644
index 000000000..5d1ab6830
--- /dev/null
+++ b/src/libxmlparser/CHANGELOG.md
@@ -0,0 +1,29 @@
+# libxmlparser ChangeLog
+
+Changes of `libxmlparser`, the XML parser library of rfd, hs485d, tclrega
+and ReGaHss (based on Frank Vanden Berghen's xmlParser). Newest version
+first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`XMLPARSER_VERSION_NUMBER` in
+`xmlparser_version.h` and `@version` in `xmlParser.h`).
+
+## Unreleased
+
+* add `xmlparser_version()`, which returns the version of the loaded library.
+  [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## 1.14 (2026-09-08)
+
+* fix undefined behaviour and a heap overflow when the child arrays of a
+  node grow or shrink, and check the results of seek, size, allocation and
+  read when a file is parsed. [#29](https://github.com/OpenCCU/OpenCCU-Base/pull/29)
+
+## 1.13 (2026-09-04)
+
+* update to xmlParser version 1.13. [#19](https://github.com/OpenCCU/OpenCCU-Base/pull/19)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/multimacd/CHANGELOG.md b/src/multimacd/CHANGELOG.md
new file mode 100644
index 000000000..57b3a4522
--- /dev/null
+++ b/src/multimacd/CHANGELOG.md
@@ -0,0 +1,22 @@
+# multimacd ChangeLog
+
+Changes of `multimacd`, the process that shares the radio module
+(RPI-RF-MOD, HmIP-RFUSB) between rfd and the HmIP server. Newest version
+first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## Unreleased
+
+* add the option `-v` / `--version`, which prints the version of multimacd and
+  of the libelvutils it uses. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+
+## 1.2.0 (2026-01-15)
+
+* first version with a version string (`version.sh`).
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/rfd/CHANGELOG.md b/src/rfd/CHANGELOG.md
index 38f2618c6..3c07901cb 100644
--- a/src/rfd/CHANGELOG.md
+++ b/src/rfd/CHANGELOG.md
@@ -1,8 +1,9 @@
 # rfd ChangeLog
 
-Changes of `rfd`, the BidCos-RF interface process, including the changes of
-the libraries it is built with (libXmlRpc, libhsscomm, libelvutils,
-libLanDeviceUtils, libUnifiedLanComm, libxmlparser). Newest version first.
+Changes of `rfd`, the BidCos-RF interface process. Newest version first. Up
+to 2.6.8 the entries include the changes of the libraries it is built with;
+since then these are in the changelogs of the libraries
+(`src/lib*/CHANGELOG.md`).
 
 Changes not yet released are collected under `Unreleased` and get the
 version and date with the next version bump (`version.sh` and
diff --git a/src/ssdpd/CHANGELOG.md b/src/ssdpd/CHANGELOG.md
new file mode 100644
index 000000000..fb90d02d3
--- /dev/null
+++ b/src/ssdpd/CHANGELOG.md
@@ -0,0 +1,20 @@
+# ssdpd ChangeLog
+
+Changes of `ssdpd`, the SSDP responder that makes the CCU discoverable in
+the network. Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`version.sh`).
+
+## 1.0.0 (2026-11-02)
+
+* first version with a version string (`version.sh`): `-v` / `--version`
+  prints it. [#294](https://github.com/OpenCCU/OpenCCU-Base/pull/294)
+* fix ssdpd failing once its socket got a file descriptor of 1024 or more: it
+  waits with `poll()` instead of `select()`.
+  ([#285](https://github.com/OpenCCU/OpenCCU-Base/pull/285), fixes [#178](https://github.com/OpenCCU/OpenCCU-Base/issues/178))
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/tcl_homematic/CHANGELOG.md b/src/tcl_homematic/CHANGELOG.md
new file mode 100644
index 000000000..a1e82d4c1
--- /dev/null
+++ b/src/tcl_homematic/CHANGELOG.md
@@ -0,0 +1,22 @@
+# tcl_homematic ChangeLog
+
+Changes of `tcl_homematic`, the Tcl helpers of the WebUI and the add-ons
+(`HomeMatic` package). Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`package provide` in
+`src/trailer.tcl`).
+
+## Unreleased
+
+* add `RemoveConfigPage`, so an add-on can remove its own configuration page
+  from `/etc/config/hm_addons.cfg`. [#48](https://github.com/OpenCCU/OpenCCU-Base/pull/48)
+
+## 1.0
+
+* version at the start of this changelog.
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/tclrega/CHANGELOG.md b/src/tclrega/CHANGELOG.md
new file mode 100644
index 000000000..6d9b3cf21
--- /dev/null
+++ b/src/tclrega/CHANGELOG.md
@@ -0,0 +1,16 @@
+# tclrega ChangeLog
+
+Changes of `tclrega`, the Tcl extension for ReGaHss scripts (`rega`
+package). Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`TCLREGA_VERSION`).
+
+## 1.4 (2026-09-06)
+
+* update to version 1.4. [#24](https://github.com/OpenCCU/OpenCCU-Base/pull/24)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.
diff --git a/src/tclrpc/CHANGELOG.md b/src/tclrpc/CHANGELOG.md
new file mode 100644
index 000000000..448d7c725
--- /dev/null
+++ b/src/tclrpc/CHANGELOG.md
@@ -0,0 +1,16 @@
+# tclrpc ChangeLog
+
+Changes of `tclrpc`, the Tcl extension for XML-RPC calls (`xmlrpc` package).
+Newest version first.
+
+Changes not yet released are collected under `Unreleased` and get the
+version and date with the next version bump (`TCLRPC_VERSION`).
+
+## 1.4 (2026-09-06)
+
+* update to version 1.4. [#24](https://github.com/OpenCCU/OpenCCU-Base/pull/24)
+
+## Older versions
+
+Changes of earlier versions are only recorded in the git history of this
+repository.