Ajax/PHP Filemanager

Hi guys,

I’m looking for a free ajax/php filemanager.
I found CKFinder, however upon integrating and having a bit play around with it, I found that certain features are disabled until I purchase I license.

Does anyone know of any free equivalents?

FYI CKFinder can be found at: http://ckfinder.com/


Or… how easy would it be to build one?