Ableton released a Microtuner recently. I have had a lot of fun playing around with it using these Scala files.
Microtuner by Ableton is a MIDI device that lets you import, edit, and generate microtonal scales. Load scale files, create custom scales, and morph between tunings in real time – all with polyphony, MPE, and Lead/Follow modes to sync your scales across instruments.
One of these days, I'd like to make more Scale Exercise Play-Along Tracks, and this tool very well might help me get the process done quicker.
Be sure to check out the demo songs in Ableton's blog post. Very cool.