We have successfully used the HCP IoT Services on

• Desktop Systems
• Smart Phones
• Raspberry Pi
• Intel Galileo or Edison
• Beaglebone
• UDOO
• Arduino Yun
• ESP8266 using C, NodeMCU or the Arduino IDE
• Texas Instruments CC3200 using Energia or MicroPython
• Freescale FRDM K64F using mbed
• Espruino Pico
• Tessel
• ...

We continue to make code snippets for various types of devices available here and show some development on Twitter.