There is this, but I didn't look into it yet https://www.automotivelinux.org/

And then there is stuff for motor controls, but it's not linux (why would it be?) http://freeems.org/

https://www.automotivelinux.org/

Carch?

TunerStudio MS is a software that works on Linux that let's you tune your Mega Squirt, which is an open source ECU for cars.

If you have an old Rover V8 14CUX engine you can use RoverGauge on Linux to see some basic engine diagnostics.