General Motors has created an API-accessible application development platform for their vehicles. This platform is accessible through an in-vehicle API and a remote API. It's only available by request at firstname.lastname@example.org
The GM In-Vehicle API supports the development of applications that interface directly with GM vehicles and their systems through the infotainment system. The GM infotainment system provides connected-car functions by linking to a driver's smartphone.
API methods include access to vehicle information, I/O commands, communication capabilities, audio and video playback, navigation, phone systems, user interface, and infotainment system commands and utilities.
The "Car as a Platform" wars have been heating up for some time now and ProgrammableWeb has published several posts on the topic, including: "Car as a Platform Wars: GM Joins Ford" by Adam DuVander, "Ford Launches Program That Provides Developers Ability to Create Vehicle-Controlled, Voice-Activated Smartphone Apps" by Janet Wagner, and "Have You Driven a Ford API Lately? Round Up on the Connected Car" by Greg Bates.