Stable source
Released sources are available on the dowloads page. http://code.google.com/p/opencc/downloads/list
Source repository
Library
You can check out the latest source code of via github.
$ git clone git://github.com/BYVoid/OpenCC.git
or download here.
GUI
A QT-based graphic user interface of OpenCC.
$ git clone https://github.com/BYVoid/opencc-gui
https://github.com/BYVoid/opencc-gui
PHP Support
$ git clone git://github.com/BYVoid/opencc-php.git opencc-php