In the course of this case study, the challenge was to develop a car computer, that facilitates energy saving, and itself works in a power-efficient way. A framework to link vehicle and external agents (for example smartphones) was developed. This framework is based upon various embedded hardware platforms that are attached to the onboard control units of the car, and it provides services to external and internal agents, such as the on-board computer Interfaces are provided to allow application developers to provide custom, helpful applications