I've uploaded one-and-a-half project to GitHub that may or may not be useful to other people:
Black Tie packages the noise functions that were previously in Okra as a seperate library. It is not very extensive yet and has only been optimized for SBCL. At the moment it includes functions for generating Perlin noise, simplex noise and Voronoi diagrams.
Clysma is a toy project that at the moment mostly serves as an example of using CL-GTK2. I don't really know where I want to go with it but for now it allows you to stroll through a running CL session and do some sightseeing.