I've been working on an electronic music controller designed around seven-limit just intonation that I'm calling the Mosaichord. It's a 4-octave keyboard using a scale with 28 notes per octave. The keys are pressure-sensitive.
Recently I got a DIY strobe tuner I've been working on up and running, which pairs nicely with the Mosaichord.
https://www.youtube.com/watch?v=Lkz-fZN54OI
The Mosaichord works pretty well these days, and I've assembled a bunch of them. Just got a new batch of PCBs yesterday to make more. There's a basic website up, but I haven't yet set up a proper web store.