ecoder is an open source web based code editor written in PHP and JavaScript, which includes real-time syntax highlighting, a file browser, file uploader, and tabbed system to allow multiple files to be edited directly on the server at the same time.
ecoder is in its testing phase… a beta product for now but I can see a good growth for ecoder.
Website: http://ecoder.gmeditor.com/
Download: http://sourceforge.net/project/platformdownload.php?group_id=251009