elFinder is a file manager for web similar to that you use on your computer. Written in JavaScript using jQuery UI, it just work's in any modern browser. Its creation is inspired by simplicity and convenience of Finder.app program used in Mac OS X.
Concurrence is a networked file editing program that enables multiple people to modify a document simultaneously. It is written entirely in Python, and uses the wxPython library for the GUI and the Twisted library for networking.
A WebDAV browser and remote file editing framework written in Java, including an RFC-2518-compliant WEBDAV client library with optional SSL support, a low-level DAV command-line client (written in JPython), and a built-in text editing component.