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There is also a new competitor written in Lazarus/FPC - ZCAD[1]. Looks barebones for now, but nevertheless interesting.
[1] https://github.com/zamtmn/zcad
I recently came across CadZinho (https://github.com/zecruel/CadZinho), which is MIT-licensed, cross-platform (also works in a browser) and uses Lua as its extension language.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.