Raspberry Pi
Raspberry Pi is the most popular low cost, credit-card sized computer that can be plug into a computer monitor or TV and connects to a standard keyboard and mouse! Best development platform to explore computing and to learn programming. Raspberry Pi also has the ability to interact outside world and ideal for digital maker projects using variety of add on Hat/Shield boards. Find wide range of Raspberry Pi boards and compatible products here. If you are a Audio fan then you can look at HiFiberry audio solutions.