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JDrafting is an open source Java application to create Technical Drawing exercises.
This application is inspired by the 'Classical Construction', also known as 'Ruler-and-compass Construction' or 'Compass-and-straightedge construction'. However, another drawing tools can be used.
(More info about classical construction: https://en.wikipedia.org/w/index.php?title=Compass-and-straightedge_construction)
Download examples in 'Files tab'
JRE 8+...
SpiroJ is a simple generator of hypotrochoids and similar roulettes. The basic principle is rolling one circle on another circle - similar to the classic Spirograph toy, but more flexible. It can export drawing to SVG, EPS and AI formats.