ISF Editor is Mac application that lets you select between a whole number of image filters and apply the to your camera feed or Syphon source. The result is published as a Syphon feed. The filters are actually shader code, and you can import from shadertoy or edit directly in this app.
I have modified ISF Editor to take in OSC signals so that it can be controlled from outside. This is handy for live visual performance. Any OSC capable device or app can be the source.
In the video you also see the apps Vezer and Volumetric: