Steel Rats is a gui wrapper for the command line source code auditing tool RATS. It examines C, Perl, php and pythoncode for keywords that could cause security holes and provides a report for you to further investigate the possible security holes.
phpEditMe is a light-weight web-based editor for websites, documentation, and source code. It includes a file manager, a WYSIWYG HTML editor, a backup system, and can (optionally) enforce the formatting of Dreamweaver templates.