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An Arduino for (almost) every situation
The main line
All have same board connections and support one of two microcontrollers – the ATMEGA168 or ATMEGA328. The 328 has twice as much memory.
Arduino Decimila
Arduino Duemilanove
Simplified power supply (automatic selection of USB or external power)
Arduino Uno
Modernized USB interface
Some black sheep
Arduino Due
More powerful processor and more connectors.
Arduino Nano
Compact version
… and many many more.
All share the same concepts, programming techniques and development tools
Arduino Skeleton
Made without a circuit board! Not commercially available.