ZendFramework2
Zend Framework
How to contribute to Zend Framework 2: http://weierophinney.net/matthew/archives/255-How-to-Contribute-to-ZF2.html
Interesting is that they support ZF1 on Subversion but for ZF2 they use Git, there is also a mirror on Github.
https://github.com/zendframework/zf2
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