Flivpee
Flivpee is a Flash video player with JavaScript widgets and is styled with CSS. It's released under the GNU General Public License.
Legend of the Green Dragon Theme: Mentat
I created a theme for Legend of the Green Dragon which is a browser based (PHP) port of an old BBS door game I used to play called Legend of the Red Dragon. It maintains the spirit and feel of the original quite well, including the ability to host your own games. If you want to see my theme in action, go here. You can create an account without providing any personal information (the email address field is optional).