Here you will find some Raspberry Pi: projects and ideas.DRC or Drogon Remote Control. This is mechanism to allow a device like Arduino connected via serial line to be controlled from a host system.
You will also find a RTOS called DROSS – The Drogon Real-time Operating System here.
“The Raspberry Ladder is a small kit comprising PCB with LEDs, resistors and switches intended to be used to experiment with the Raspberry Pi’s GPIO functions and hopefully to get people interested in soldering up their own projects. Soldering is not difficult and it’s a good skill to learn if you are keen to learn more about electronics. (or repairing jewelry!)”