MIDIviaOSC

MIDIviaOSC is an open source app that sends MIDI data over a network using OSC. It will take MIDI, convert it into OSC messages which use the MIDI data type, and send these OSC messages somewhere.

If it receives any OSC messages which use the native MIDI-over-OSC data type, it will convert those messages into MIDI messages, and send them to one of the MIDI devices on your system.