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erzberg is an open source (MIT) web app that turns heightmaps, GeoTIFFs and fetched elevation data into line art for pen plotters. It runs locally in the browser, with no account or upload. It has 41 draw modes, among them contours, hachures, flow lines, stipple and a single-line TSP, and the SVG export has one layer per pen, hidden-line removal, pen ordering and a plot-time preflight.
Source: https://github.com/sorny/erzberg