very good CAD software
Drawing, graphics conversion, software development, administration.
A simple LaTeX {picture} drawing tool
2D CAD for precise drawing
Easy and smart classic color picker
Paint brush program which you can draw objects, Object Painter
a race scenario drawing tool
Vector drawing program for LaTeX using PSTricks
Simple and intuitive 2D vector drawing for electronics and not only.
Syntax Tree Drawing Software (Linguistics)
ARO helps physically disabled students to create mathematical drawings
Free drawing software for Windows, Mac OS X, and Linux
Vector based drawing software designed for RPGs