From software theremins to MIDI programs, here's a list of ways your PC, phone, or tablet can help you experience a theremin:
Animoog for iPad and iPhone
Moog Music's iconic synthesizer app, now available for the iPhone! Make theremin-like sounds with the unique touchpad keyboard.
New Theremin iPhone app
A new theremin app by Kingsley Sage is now available on the Apple App Store for the iPhone. The functionaility is modelled on the Etherwave and features continously variable waveshape with a variable base pitch, two octave performance range, tone and echo/delay, and a performance display that shows you the nearest note, with optional sharps and flats display. Let us know what you think!!
Take a theremin everywhere you go with Frontier Design's theremin app for iPhone. Is that a UFO in your pocket?
Mouse, PC keyboard and Joystick Theremin
Windows software theremin that can play any midi instrument. Mouse, joystick or keyboard controlled. Also can play chords. Mouse scroll wheel can adjust any desired controller, e.g. of course, tremolo. Very configurable. Pitch bend ripples option to make it easier to locate notes, in any tuning. Visual display with impression of curtains of subtle shades of colour.
Freeware circuit design and simulation software for Linucks and Mac OSX.
Clanger - free software theremin for the Pocket PC
I'm addicted to Clanger! It's a free software theremin for the Pocket PC by the great and creative folks at Silicon Machines. Clanger offers adjustable delay and tremolo effects, as well as excellent sound. You can tweak it to determine the range of pitches it will produce, making it easier to play various songs. Highly recommended.
A professionally developed VST plugin that turns your webcam into a 2 oscillator video theremin. Available for Mac and PC.
Synaptics touch-pad theremin (zip file)
Synaptics has just released free software to allow you to play their TouchPad device like a theremin under any flavor of Windows ('95 through XP). The device is a capacitive touch-sensor designed to be used like a mouse. Now, you can use it for more than pointing!
Digital Ear - Realtime pitch to MIDI
I'll update this listing once I've fully evaluated this software, but it appears to be nearly perfect for real-time pitch-to-MIDI signal conversion for the theremin. It even supports high resolution 14-bit pitchbend control signals!
Control Voltage to MIDI converter for MC68HC11
If you're a hardware hacker as well, this file might interest you. It's a set of assembly subroutines for the Motorola MC68HC11 chip to allow you to convert control voltages to MIDI signals. It uses the chip's built-in serial port and A/D converted, so a black box version of this project should be fairly cheap/easy to make. I believe this came from the Troika Ranch web site. The usual disclaimer applies - I do not support this software, but I may be able to steer you in the right direction if you have technical questions.
MidiGlove is a program which lets you play a MIDI instrument with a Mattel Powerglove connected to a PC. Make a fist to play a note, move left and right to control pitch, in and out to control volume. Up and down controls pitch bends. I've tried this and it works very well. Not quite a theremin, but along the same lines.
Gleetchplug - Free VST Theremin for the Mac
GLEETCHPLUG is a free bundle of plugins for VST/MAS/RTAS apps. on Mac Os9.x computers. Version1.0.1 contains Therevox: a mouse theremin fully automatizable. Requires Pluggo runtime environment (free) downloadable from Cycling 74 site.