A CAD platform that lives in the browser. Models are not saved as local files but kept as a version chain by the service, several designers can work on the same model at once, and drawings stay linked to parts and bills of materials. The free tier targets personal non commercial use, and documents are public by default.

A two dimensional drafting program that has done one job for twenty years: layers, blocks, dimensions and scaled printing, exchange format support, and almost no demand on hardware.

A two-dimensional drafting program under the GPL: more than forty construction tools, a library of over 4,800 standard parts, command-line converters and a scripting interface, with a free community edition.