TYPO3.org is the main developer resource of the TYPO3 project, a free CMS framework released under the GPL. This site provides lots of information about creating sites, writing extensions and developing the core of TYPO3.
Meatball is a community of active practitioners striving to teach each other how to organize people using online tools. Members here are either community managers or are building supporting tools; MeatballOutreach lists some of our affiliated projects. We