There is a wide variety of computer graphics related software packages available on the net. The resources we list here are ones we consider particularly useful to researchers.
Most resources listed here come with source code.
Also examine the comp.graphics FAQ collection for useful information about all sorts of free resources. This series focusses on short to medium length pieces of code which perform a wide variety of tasks. There are many great documents and code bits at David Eberly's site , including a quaternion tutorial and code, animation information, image analysis, etc. The journal of graphics tools has source available on-line for some of the articles it publishes. The book Numerical Recipes is now online in Postscript and PDF forms.