A full-featured MySQL management tool written in PHP. It consists of a single file ready to deploy to the target server.
Zenphoto is a standalone gallery CMS that just makes sense and doesn't try to do everything and your dishes.
Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions.
Calendar application that can be configured as single, multi-user calendar, or as an event calendar viewable by visitors.
Like the hand-held calculator, but it runs directly in your browser. A must have for any advanced math student.