sjFilemanager - open source ajax filemanager based on PHP, but JS part can use different backend. For more details go to http://freaksidea.com/javascript/show-1-sjfilemanager-besplatnyi-ajax-fail-menedzher
** Guys I have built a much more powerful Fully Featured CMS system at: https://github.com/MacdonaldRobinson/FlexDotnetCMS
Macs CMS is a Flat File ( XML and SQLite ) based AJAX Content Management System. It focuses mainly on the Edit In Place editing concept. It comes with a built in blog with moderation support, user manager section, roles manager section, SEO / SEF URL
Kjora Framework is a lightweight PHP 5.3 framework. It provides an architecture to build a Model-View based website, with a dynamic data access object, and a "One Page - One Class" system to design it.
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Building Blocks that build off of each other. Libraries in PHP, CSS, JavaScript, and examples included to custom tailor them to your needs. File Manager -> uses File PHP class, Directory PHP class, CSS menu, JavaScript enabled CSS menu for IE.