Ship developer platforms in weeks, not years.
Open source tools for Kubernetes fleet management, hosted control planes, and internal developer platforms.
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We build open source infrastructure tools that compress 12-18 month platform buildouts into weeks. Everything is Apache 2.0. No vendor lock-in, no surprise paywalls.
 Butler Multi-cluster Kubernetes management. One CRD creates a complete tenant cluster with networking, storage, and addons across any infrastructure provider. |
 Steward Hosted Kubernetes control planes. Run API servers as pods instead of dedicated VMs. Targeting CNCF Sandbox. |
 Butler Portal Internal Developer Platform built on Backstage. Service catalogs, golden paths, and self-service environments. |
| Repository | What it does | |
|---|---|---|
| Platform | butler | Project overview, architecture, governance |
| butler-controller | Cluster lifecycle, IPAM, addon management | |
| butler-api | CRD type definitions (the API contract) | |
| butler-server | REST/WebSocket API backend | |
| butler-console | Web UI for cluster management | |
| butler-cli | butleradm + butlerctl CLI tools |
|
| butler-charts | Helm charts for all components | |
| butler-bootstrap | Management cluster provisioning | |
| Control Plane | steward | Hosted control plane operator |
| capi-steward | Cluster API provider for Steward | |
| Ecosystem | butler-portal | Backstage-based IDP |
| butler-image-factory | OS image build and hosting service |
Butler Portal ships with purpose-built plugins for the full platform engineering lifecycle.
 Chambers Private dev environments. SSH access, editor deep links, dotfiles. No local setup required. |
 Keeper IaC registry and governance. Terraform modules, Helm charts, OPA policies, approval workflows. |
 Herald Telemetry routing at fleet scale. Visual pipeline builder for logs, metrics, and traces. |
 Alfred Answers from your infrastructure knowledge. Indexes docs, runbooks, and incident history. |
 Jeeves Proactive drift remediation. Declares desired state, detects drift, auto-remediates. |
Stable: Harvester HCI, Nutanix AHV | In Progress: Proxmox VE, AWS, Azure, GCP
- Getting Started to deploy your first cluster
- Contributing Guide to start building with us
- GitHub Discussions for questions and ideas
- Discord for real-time conversation