Arduino
Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Macromedia Flash, Processing, Max/MSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free.
The Arduino developer team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, David Mellis and Nicholas Zambetti.