Gutuma is geared, not towards mass-marketing companies and spammers, but web developers who need a system that is easily integrated with existing web sites.
Encode Explorer is a file browser.
Game of planet invaders, Amahi style
Apache Subversion is a full-featured version control system originally designed to be a better CVS.
Headphones is a SABnzbd add-on that automates your music downloading. Import all your favorite artists from iTunes, and watch for any new albums be released.
Like the hand-held calculator, but it runs directly in your browser. A must have for any advanced math student.