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 bunch of unofficial icons based on Google's Material Design Icons.
2D CAD software
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.