A collection of packages providing extra functionality for GNU Octave
Display, convert, and edit raster image and vector image files
View Sixel images in Windows, and Sixel image repository
Extend abcm2ps to support direct generation of PNG, SVG and PDF files
3D Software Renderer in 700 Lines
A small C library for building user interfaces with C, XML and CSS.
Extract the colour palette from an indexed png image.
Free drawing software for Windows, Mac OS X, and Linux
Not your usual Architectural Modeler