Sonic Visualiser is a free, open-source application for Windows, Linux, and Mac, designed to be the first program you reach for when want to study a music recording closely. Sonic Visualiser is one of a family of four applications.
Vovoid VSXu is many things – a music or audio visualizer displaying real time graphics to your audio or music. It is also a modular visual programming language with which you can quickly build and explore real time graphics effects and designs. VSXu’s underlying code can be re-used in other projects and is optimized for real time graphics and games. Grab it for free.