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Raspberry Pi
The Raspberry Pi is a credit-card sized Linux computer that plugs into 7" monitor and a keyboard. It’s a little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and temperature monitoring. It also plays high-definition video. http://www.raspberrypi.org/
Arduino
Arduino micro-controllers can sense the environment by receiving input from a variety of sensors (i.e. temperature, humidity, etc) and can affect its surroundings by controlling lights, motors, and other actuators. http://www.arduino.cc/