Developer Resources
Community Developers
Apps SDK
The Apps SDK provides tools to author and publish Apps, a web-based extensions framework for BitTorrent to allow for easy extensibility by 3rd party developers through a simple API, without compromising the renowned "lightness" of the client.
Web API
Any application can tap into the power of BitTorrent with our Web API.
Guide to Creating Skins
Skin your BitTorrent client here.
BitTorrent.org
This is the official website for the BitTorrent protocol and the current list of (proposed) extensions. The site also describes the process for proposing new extensions to the BitTorrent protocol.