"CEPL is an extension for common lisp that makes working with OpenGL simple and familiar," according to Baggers. There is a blog and a number of videos about CEPL. The readme cautions: PRE-ALPHA.
"BG" gives a take on the history of Macintosh Common Lisp. Rainer Joswig responded to a number of points in the ensuing /r/lisp discussion.
3bgl-shader is "a Common Lisp DSL for generating GLSL shaders," by Bart Botta. Needs people to try it out and provide feedback.
Pseudo is a Lisp-powered roguelike multiplayer browser game, with AGPLv3-licensed source code available. Created by Matthew Carter.
The Infected is a roguelke survival horror game in Common Lisp, by Jan Tatham.
Mariano Montone writes about embedding Python syntax (and functionality) in Common Lisp sources.