iTree Pro-XQ Powertree
This is an "Explorer" style file manager tree that is cross-platform and designed to display in browsers as part of a web application. Numerous facilities are provided for editing and managing contents drawn from databases. This programme/applet is primarily designed for integration with your own in-house scripts and web application, so it has numerous "hook-in" features for communicating with your application and visually dovetailing with it.