Alternative key lay-outs e.g. pentatonic
Virtual MIDI controller for Linux, Windows and OSX
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Alternative keyboard layouts would be great: a virtual keyboard with layouts for 5, 7, 12 (the standard) or 19 keys per octave could be practical to experiment with alternative tunings. Keyboard layouts defined by users would be a nice feature.
See e.g. https://gervill.dev.java.net/examples/TuningApplet1.html or http://www.huygens-fokker.org/scala/snapshot8.png