Top 2 color-theory open source projects

Classybrew is a utility for generating statistical class breaks in your data and applying colorbrewer theory to you color palette.

APCA (Accessible Perceptual Contrast Algorithm) is a new method for predicting contrast for use in emerging web standards (WCAG 3) for determining readability contrast. APCA is derived form the SAPC (S-LUV Advanced Predictive Color) which is an accessibility-oriented color appearance model designed for self-illuminated displays.