If you use a projector for presentations or movie nights, you need this app

"QLab was designed specifically for playing back sound, video, and light- and show-control cues for all types of situations. It may be overkill for movie night, but with the holidays fast approaching, you might want to impress your family and friends with a seamless, professional video presentation."

"For me (and most consumers), the free version is enough, but the paid version, which is $119, adds features like network, MIDI, MIDI File, Pause, Devamp, Target, Arm & Disarm, Script Timecode, and Timecode trigger cues."

Read at ZDNET