Amazon.com: KONIX MIDI Keyboard Controller 25 Key, Portable USB MIDI with Velocity-Sensitive Mini Keys & OLED Screen Display for Mac/ PC, Small MIDI Keyboard with Unique LOOP Function and 8 Backlit Drum
AudioSwift - Use your trackpad as a MIDI controller - YouTube
7 MIDI Controllers That Show We're Evolving Beyond the Standard Keyboard – Flypaper