The recommended site for jailbreak support. Anyone can ask questions, and they will be answered quickly by a dedicated community of jailbreakers.
The jailbreak subreddit. Casual jailbreak conversation and announcements as well as help and support.
A wiki containing information detailing jailbreak exploits and techniques. A great place for aspiring developers to start.
A collection of documentation written by developers to help each other write extensions (tweaks) for jailbroken iOS.
A site that contains information about current and previous jailbreak releases for your device and iOS version.