TouchOSC - Modular OSC and MIDI control surface for iPhone / iPod Touch / iPad / Android
MadMapper - The Mapping Software
Open Stage Control - Libre and modular OSC / MIDI controller
Resolume - Resolume is an application for live video performances.
Lemur - Lemur, the professional MIDI and OSC controller app that doesn't cut corners, has evolved.
Linux Show Player - Sound player designed for stage productions