If you want to act as a remote-starter or otherwise control vehicles, the EVO-All modules provide a simple 4-wire datalink that allows you to do so on a whole lot of different car and truck models.
To make communicating with the EVO-All easy, the EvoLink library–which runs or Arduino and is designed to be easily ported to any microcontroller that supports C++ code–is now available as open source (GPLed) and under dual-licensing for commercial products.
Check it out on the project site.
