Freeframe Effects
Freeframe is a standard for video effects plugins that is supported by most modern VJ software packages
Syzygy use their own custom Freeframe effects to manipulate video content and live camera feeds, adding all kinds of live interactivity to their shows.
Syzygy plugins are also available for use by other VJs; some for free and others as commerical products.
For more information about the standard, visit the Freeframe website