Another drawing editor for LaTeX with PSTricks & TikZ
Qt Visual Graph Editor
2D CAD for precise drawing
A modern digital design tool.
Growth-grammar related Interactive Modelling Platform
A graphical Finite State Machine (FSM) designer.
Universal CNC
Free image and chart digitizer
Free drawing software for Windows, Mac OS X, and Linux
Hand Written Equation Creator
A drawer for origami crease pattern
Not your usual Architectural Modeler