darktable is an open source photography workflow application
JaxoDraw: Feynman Diagrams made easy!
2D & 3D TeX-Aware Vector Graphics Language
Free and open source vector graphics editor for Windows, Mac, & Linux
Cross Platform GUI Toolkit
A simple multi-platfom 2D Animation Software for all ages!
Simple and intuitive 2D vector drawing for electronics and not only.
Inkscape plugin for generating the fibonacci pattern
A graphical Finite State Machine (FSM) designer.
Free drawing software for Windows, Mac OS X, and Linux
Interactive designer for Celtic knots
Not your usual Architectural Modeler
Advanced script editor IDE for squirrel/pawn/lua and more
dedalo is a 2d cad drawing software written in python3.
Inkscape extension to add and edit GNUplot graphs
A tool written in Python to draw Splines in MAXONs Cinema 4D