Buchla Lightning II: Specialized MIDI controller that senses the position and movement of handheld wands and transforms this information to MIDI signals.
Chordboard: CX10 Keyboard Controller sends out preprogrammed chords similar to "one touch" chords on a Casio Tone
Digital Dance System: Sensor system designed by DIEM (Danish Institute of Electroacoustic Music)
Gulbransen, Inc.: Makes products which add MIDI capabilities to acoustic pianos.
IBK: Knob-based MIDI controllers for hard or software synthesizers
Kenton Electronics: UK specialists in MIDI to Control Voltage conversion and MIDI control
Marimba Lumina: Electronic MIDI controller. Includes a traditionally arrayed set of electronic bars and some (not so traditional) trigger pads and strips (reminiscent of early ribbon controllers).
Rubicon Systems: Makers of hardware and software to turn a Palm Pilot into a MIDI controller
STEIM products: Sensorlab: Small, general purpose, analog to MIDI interface for the prototyping of musical instruments and interactive control systems.