VDMX - VDMX5 was created from the ground up to meet the demands of realtime video performance.
MadMapper - The Mapping Software
Resolume - Resolume is an application for live video performances.
TouchDesigner - TouchDesigner is a visual development platform that equips you with the tools you need to create stunning realtime projects and rich user experiences.
QLab - QLab, Live show control for Mac OS X.
PraxisLIVE - Hybrid visual environment for live creative coding