GLava is an OpenGL audio spectrum visualizer. Its primary use case is for desktop windows or backgrounds. Displayed to the left is the radial shader module, and here is a demonstration video. Development is active, and reporting issues is encouranged. You can pass BUILD=debug to the makefile for debug builds of both glad and glava, and you can manually specify install targets with INSTALL=..., possible arguments are unix for FHS compliant Linux and BSD distros, osx for Mac OSX, and standalone which allows you to run GLava in the build directory.