XBMC Add-ons are extensions that can be run from inside the XBMC GUI. They are usual written by third party developers and published to our official repository. Add-ons can also be published in other repositories or as stand alone zip files anywhere on the internet. Examples of Add-ons include video website streams, scrapers, skins and scripts.
XBMC Add-ons are typically written in python.
Add-ons should all work with the latest Frodo and Gotham Releases. Each time XBMC is released we add new features but try not to break much compatibility.