There are 2 repositories under lsdj topic.
A frontend for the SameBoy GameBoy emulator, with a focus on music creation. It runs standalone and can be used as an audio plugin (VST) in your favourite DAW!
Documentation for Little Sound Dj (LSDj), the Game Boy music program
A music sequencer inspired by LSDJ and nanoloop for circuitpython.
Arduinoboy Firmware for Teensy 2.0, for serial MIDI communication to the Nintendo Gameboy.
Little GP Tracker (Piggy Tracker)