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Veejay is a visual instrument and real-time video sampler. It allows you to "play" the video like you would play a piano. While playing, you can record the resulting video directly to disk (video sampling).
CthughaNix is the reincarnation of Cthugha-L, a Linux port of one of the first audio visualization software packages, known as "An Oscilloscope On Acid".
Pixapr is a visualization plugin for XMMS, but not regular visualization plugin. It will output REAL light show by devices controlled via parallel port. It is based on XPLSISNJASP and Palace. Pixapr stands for Pixapr Is Xplsisnjasp And Palace Reloaded.
The UHAPI4Linux project is working on an open source implementation of UHAPI:
1. Provide development platform on PC for application and middleware
2. Demonstrate UHAPI concepts
3. Bootstrap developers with UHAPI
theGrindHouse is a frame based film or image filter rendering engine. A filter chain is constructed from available filters then applied to each frame. Written in C with GTK+2.