Carman on the N900 had significant flaws. I had hoped that someone would take it on & smooth out its problems.

I understand if that is what you wanted specifically. I do pretty well for car-based apps with pyOBD for reading & resetting OBD2 error codes, Modrana for navigation, & if I just need a big speedometer, jSpeed.

The N900 is such a great car computer that I got a suction mount holder & put it near the rear-view mirror when driving. It plays music through the radio, routes calls through the speakers, & does the navigation via Modrana.