[_eLRIC]

Promising similar open source project : https://github.com/topisani/OTTO

The progress made by the guys these last months is impressive, and both the UI and hardware aestetics really shines (while they are inspired by the OP1, they now have their own personality)

[tinco]

Awesome! How did you find out about this project? I've been looking to work on a project like this and didn't find them.

[monkeynotes]

I have also seen this project while looking for an open source VST in a pi-box thing. Looks really neat.

[fit2rule]

There are a couple of these kinds of devices you might not have tuned into yet, namely:

Axoloti:

http://www.axoloti.com/

(There are great cases/knobs/button boxes for this, for example check this thread out for the mad directions things can take: https://www.muffwiggler.com/forum/viewtopic.php?t=158092)

Organelle:

https://www.critterandguitari.com/organelle

Another very cute, very programmable portable digital synth ..

And then there are things like this, which I had the pleasure of playing recently at superbooth:

Sonicware ELZ1:

https://www.sonicware.jp/elz-1-1

So, yeah .. lots of little portable, digital and analog synths in the OP-1/-Z style format.

[pcerdam]

At least in my case, I remember seeing them somewhere here on HN before. It's amazing project, for sure!