Relayer: an app (Windows and OS X) that enables musicians who play the QWERTY computer keyboard, or the AXiS-49 MIDI controller, to play in a wide variety of isomorphic note layouts (including the Wicki-Hayden).
Qwertonic: site with Java, Flash, and PC applications enables children and non-musicians, to play their PC keyboard as a Wicki/Hayden instrument, with three octaves of 12 equal-tempered pitches.