ROM Tuning Open Source
We stumbled across this site when we were looking for something else.
As the title says they are sites dedicated to open source software that tunes the car’s OE ECU. You need hardware for non OBDII/OBD2 cars but they are link to people who offer these services.
Here is a link to the link on the StrikeEngine directory for companies making performance chips and stand alone ECUs
Live Streams/Feeds (may take a few seconds to open when feeds are updating)