graphviz is a set of graph drawing tools for Unix or MS-Windows (win32), including a web service interface (webdot). Source code and binary executables for common platforms are available. Graph drawing addresses the problem of visualizing structural information by constructing geometric representations of abstract graphs and networks.

A vector-based drawing program in the spirit of Adobe Illustrator and Corel Draw.

ivtools is a collection of vector-graphic drawing editors for PostScript, TeX, and web graphics production.

Sodipodi is a vector drawing application. Saves in svg format.