[unmaintained, maintainers welcome] Contains named RGB colors; supports color combinations, alpha channels and HSV conversion/manipulation.

Prolific author of this library has switched to another language. According to him, would-be maintainer should fork and maintain for a year, announce the library resurrection, drop him an e-mail so he would redirect users, and convince Zach Beane to use the fork in Quicklisp.

Calling it a graphics library is a bit of an overstatement, but its primary purpose is to be used in graphics.

Homepage: GitHub

License: LLGPL