Resolume - Resolume is an application for live video performances.
Metastream - Watch streaming media with friends
QLab - QLab, Live show control for Mac OS X.
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Millumin - Software to create audiovisuals shows.
Kosmi - Digital Hangouts Reinvented