Yamaha DX7II Librarian
Patch and cartridge manager for the Yamaha DX7II-FD / DX7II-D / DX7s / DX7 line of vintage synths. Running in the browser and communicating with the synths via WebMIDI.
I created this specifically for the DX7II features support, which all the other DX7 librarians lacked, to have an instantly usable platform-agnostic app and also because it seemed like a fun project (it was!).