PHP-jQuery-Terminal-Emulator
A simple PHP terminal emulator using jQuery + PHP. To install simply place on your server and modify the term.php file to set password, default directory, etc.
Security
Please don't be stupid. Depending on your server setup this could potentially open you up to some major security issues if not properly locked down. The system uses sessions for authentication but that doesn't mean an extra layer of protection wouldn't be a good idea.