Maybe not all know that pc can be used also in auto infotainment systems.
There are various preassembled products and who spend time to realize a carPC (or carputer), in fact is a real pc for car, you can find many info and sites about on net.
You must know that there are specific software for these devices and they run in operating systems that we already know: Windows, Linux, Mac.
So here is a list of full free software to use for carPC:
inCar Terminal (for Windows 2000/XP/ME)
Ride Runner (for Windows)
DashPC (for Linux)
LinuxICE (it isn’t simply a software, but a real Linux distro for this purpose)
CarPCGarage.com (software written in Java so platform indipendent)