Free drawing software for Windows, Mac OS X, and Linux
Dia Diagram Editor is free Open Source drawing software for Windows, Mac OS X and Linux. Dia supports more than 30 different diagram types like flowcharts, network diagrams, database models. More than a thousand readymade objects help to draw professional diagrams. Dia can read and write a number of different raster and vector image formats. Software developers and database specialists can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.
K-3D is the free (as in freedom) 3d modeling, animation, and rendering system.
Windows based editor designed to allow writing extensions covering any user format of raster fonts. Supports fixed/variable character height/width, incomplete character sets, etc. Has a lot of useful character-editing functions (italicize, bold, shift...