Libertree!

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If you're a developer or sysadmin, and want to try the software yourself, you can try out our quick installation script, which will plant a standalone demo tree for you with minimal effort, and no up-front cost. Give Libertree a spin without committing any server space of your own. Install Now » http://maple.libertree.org/posts/show/37399
Libertree is licensed under the GNU General Public Licence. Peruse or grab the source code from github.

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