01. Raspberry Pi on Wikipedia

02. The official website of The Raspberry Pi Foundation

03. The official Raspberry Pi Forum

04. Rastrack – the Raspberry Pi tracker

05. The official WordPress website

06. The WiringPi project

07. The WiringPi gpio utility

08. The official Pi4J website

09. Pi slices served by Robert Savage

10. The official website of the Vaadin framework

11. LED calculator for single LEDs

12. The official Arduino forum

13. MiLight/EasyBulb/LimitlessLED developer section, documentation