Tools I’ve made

• I’ve contributed some generator modules for the v001 performance framework that you can find on the 001 wiki.
• Brush 0.2: a free visual performance application for Mac and Windows.
• Max/MSP/Jitter mailing list Mozilla search plugin — this doesn’t work anymore since they moved the archives.

Tools I would recommend

• For live visual performance, VDMX and Modul8 (both Mac only). On Windows, I’ve heard good things about Resolume, Visual Jockey and VJAMM but haven’t used them. On Linux, I would recommend Pure Data.
• For rapid prototyping and experimentation with new media, including live visual performance, Max/MSP/Jitter or Pure Data. Max costs money and has terrific documentation and tutorials. PD is free but the documentation needs a lot of work.
• For batch-processing and converting your video for performance, ffmpegX.