darktable is an open source photography workflow application
JaxoDraw: Feynman Diagrams made easy!
Free and open source vector graphics editor for Windows, Mac, & Linux
Cross Platform GUI Toolkit
Model Railway CAD program
2D & 3D TeX-Aware Vector Graphics 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
A simplified and no-frills vector graphics editor
A bunch of unofficial icons based on Google's Material Design Icons.
Vector drawing program for LaTeX using PSTricks
Simple and intuitive 2D vector drawing for electronics and not only.
A graphical Finite State Machine (FSM) designer.