AdaFruit, Seeed, SparkFun, DFRobot, DigiKey
And over at SparkFun they have the FreeSoC2 dev board, which is a collaboration with Jon Moeller. This provides two ARM Cortex-M3 SoCs. The main one providing 72 GPIOs while the second providing 48 GPIOs and acting as a programmer for the first. The board simulates an Arduino Uno R3 so can be used in the Arduino IDE or you can use the Cypress IDE.
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