Wiard

Grant Richter builds the Wiard series of modules. His older, discontinued, 300 Series modules are highly collectible (in 6U format.) Current 1200 Series modules are built by Grant himself and are based on the "Frac-rack" (3U) system. They require plus or minus 15v power and are calibrated 1v/octave. Connections are 1/8" mini-jacks. Currently available modules include a joystick, the Joystick Axis Generator, Noise Ring, and the Borg and Boogie Filters. (excerpted from Doug Wellington's excellent Analog Notes site).

Several Wiard designs have been licensed for production by other manufacturers:

Wiard/Malekko Borg 2 Filter

Wiard/Malekko Boogie Filter

Makenoise Wogglebug

Additionally, the "Wogglebug #3" design has been left available to the public by Wiard, and heavily embraced by the Synth DIY community

Wogglebug