Midi Studio - Full-featured, modular MIDI control surface for iOS
Virtual MIDI Piano Keyboard - Virtual MIDI Piano Keyboard is a MIDI events generator and receiver.
Navichord - Intuitive chord sequencer and MIDI controller for iOS
Free Piano - FreePiano is a virtual MIDI keyboard and a VST host for windows.
IsoPad - IsoPad lets you use your Windows tablet to play electronic MIDI instruments.
Virtual Piano - Free Online Piano App