Another Raspi.tv kickstarter!
  RasPiO Pro Hat is a small Raspberry Pi add-on which... protects the Pi's ports in case you make a wiri...

Arduino 1.6.x for Raspberry PI Jessie
Edit May 17 2016: Official support now: https://www.arduino.cc/en/Main/Software , still marked experimental Edit ...

Pi operating systems
http://www.hongkiat.com/blog/pi-operating-systems/  

Testing USB Serial TTL adapters
A program, SerialTester,  a guide and test results. Also updated Prolific PL2303HXA driver misery solution. ...