Wavefront Technologies
- Makers of both a traditional theremin and a portable model, and also a MIDI interface.
- http://www.theremin.ws/

Theremaniacs Theremin and Harmonic Percolators
- Manufactures a pitch only Theremin with changeable timbre. Also presented is the Harmonic Percolator, a distortion pedal.
- http://www.theremaniacs.com

PAiA Theremax
- Information about theremin kit from PAiA.
- http://www.paia.com/theremax.htm

Australian Theremin Kits
- Simple kit. The completed instrument puts out a pure sine wave tone.
- http://thereminkits.com/