RS offers Arduino Yún with Linux OS
Arduino Yún combines the existing Arduino Leonardo, based on Atmel’s ATmega32u4 8-bit microcontroller, with an embedded Atheros AR9331 Wi-Fi system-on-chip (SoC) running Linino, a MIPS GNU/Linux variant of OpenWRT.
The board comes with a Bridge library which can be used to navigate complex web services that use verbose, RAM-intensive text-based formats such as XML by delegating all network connections and processing of HTTP transactions to the Linux-based SoC.
In common with Arduino Leonardo, the Yún has features such as 14 digital input/output pins, seven pulse width modulation (PWM) channels and 12 analogue inputs.
It also incorporates a 16MHz crystal oscillator and a microUSB connector plus a Standard-A type USB connection and a PoE compatible microSD card socket for additional storage.