darktable is an open source photography workflow application
Model Railway CAD program
Free and open source vector graphics editor for Windows, Mac, & Linux
2D & 3D TeX-Aware Vector Graphics Language
converts PostScript or PDF files to other vector graphics formats
JaxoDraw: Feynman Diagrams made easy!
Draw vector graphics to scale using a descriptive language
A simple multi-platfom 2D Animation Software for all ages!
A simple LaTeX {picture} drawing tool
Another drawing editor for LaTeX with PSTricks & TikZ
CAD application for Technical Drawing exercises
Vector drawing program for LaTeX using PSTricks
Simple and intuitive 2D vector drawing for electronics and not only.
Professional quality open source illustration software