Globe*Trotter is a guestmap. It allows Web site visitors to mark where they live on a map and include their personal comments, instead of merely tacking their personal regards onto the end of a long list. It benefits your visitors because they can easily read other's comments and add their remarks in a fun and novel way. It also benefits you, the webmaster, because more people will be likely to give you feedback and you will be able to see where your visitors are. A free hosted version of Globe*Trotter (with no ads) is available.
BBSzilla is an extension for Mozilla-based browsers such as the Mozilla Application Suite and Firefox. It gives the browser the ability to connect to Bulletin Board Systems that utilize TCP/IP, such as Hotline servers. There is functionality for multi-user chat, single-user messaging, as well as server-side and P2P file sharing, threaded news, single-thread bulletins, and more.
Yawda is an MVC Web development application framework based on Struts. With it, you can easily output HTML, SVG, PNG, JPEG, PDF, RTF, XML, JS, CSS (and any text file) with data from several sources. It uses cayenne ORM (or another tool like jaxor, hibernates, or jdbc) and rhinoJS or Java for the model, Struts for the controller, and Velocity/iText/Batik for the view component.