It's an Akai APC40MKII, originally designed for Ableton - but it's standard midi stuff, I use it everywhere: Ardour, D:Light, QLab, you name it.
Here it's plugged into Isadora, our video playback software, where it will handle 2 outputs to 4 screens surrounding the audience. That console allows me to fine-tune stuff much easier than typing numbers on the keyboard.
Ableton Live is a great piece of software, tho for theatre I end up using QLab a lot more often. And for serious video trickery (and fun), nothing beats Isadora!