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Intel also has the Galileo board which is hardware and software pin-compatible with shields designed for the Arduino Uno* R3.

http://www.intel.com/content/www/us/en/intelligent-systems/g...

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The Galileo's one of those boards where it's very important to pay attention to the fine print. For example, the GPIO controller is hanging off a relatively slow I2C port, so access to GPIO is much, much slower than even the lowest-end Arduino. Also, it's a modified 486 which takes multiple clock cycles to carry out many instructions that are single-cycle on modern ARM, so it's not as fast at arithmetic as the clock speed would suggest.

Be careful though, the Galileo emulates AVR code and is orders of magnitude slower than a real Arduino. Don't expect to pick up any shield and make it work, unfortunately.

The Galileo actually only emulates a subset of the Arduino libraries. The AVR libraries themselves are, for the most part, not supported. This makes many popular libraries unusable even when hardware is not an issue.

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