LiquidMaya is a Maya to Renderman plug-in that handles full Renderman output support with a focus on speed, efficiency, and extensibility. Its features include procedural rib generation, full network rendering support, segmented rib files, a shader assignment interface, and much more. Along with the ability to write full C++ plug-ins, it is incredibly easy to script Liquid with Mel. Liquid was used for the visual effects of the "Lord of the Rings" movie.
ManiWheel is a GL hack for xscreensaver. It draws the spinning Tibetan mantra, "OM MANI PEME HUNG" for the blessing of all beings. It features transparent and no-transparent modes, two internal textures, the option to enable or disable a specular image. The height, radius, shininess, distance, and speed of rotation may be changed. It can also be used to draw any texture in the .rgb format.