very good CAD software
2D CAD for precise drawing
Simple and intuitive 2D vector drawing for electronics and not only.
Renders glycans and glycopeptides with frag. info using SNFG format
Madeline 2.0 Pedigree Drawing Engine (PDE)
Free drawing software for Windows, Mac OS X, and Linux
A drawer for origami crease pattern
dedalo is a 2d cad drawing software written in python3.