The playground is a publicly-editable wiki about Arduino.
Manuals and Curriculum
Arduino StackExchange
Board Setup and Configuration
Development Tools
Arduino on other Chips
Interfacing With Hardware
Interfacing with Software
User Code Library
Suggestions & Bugs
Electronics Technique
Sources for Electronic Parts
Related Hardware and Initiatives
Arduino People/Groups & Sites
Exhibition
Project Ideas
Languages
Participate
Running Arduino on...
The Arduino programming software runs on a number of different computer platforms. The links below lead to tutorials and explanations on how to get it running on different platforms.