The Desktop
This is a graphical desktop system, written in Javascript, with a server backend written in Perl. It is meant for remote system administration. It let's you manage and edit your files in a user-friendly GUI environment, inside your browser.
It is not a very mature piece of software yet, and it has numerous bugs and issues with bugs in browsers, but it works, after a fashion. Any outside contributions to the development of this would be warmly welcome, as I don't currently have much time to work on it.
More information is available in the discussion thread.