adx is a minimalistic but massively Web-enabled address book that runs completely in your Web browser. It supports comprehensive details for each contact entry, including user identifiers and profiles for Skype, Twitter, Flickr, Delicious, Facebook, LinkedIn, studiVZ, instant messengers, etc.
EnterTrack is a web-based artifact tracking/management system written in PHP4. EnterTrack is derived from Issue-Tracker and adds a number of features particularly useful to larger groups. EnterTrack provides large organizations with start-to-finish tracking of artifacts (artifacts can be problems, bugs, requests, projects, etc.), group collaboration for artifact management, and status reports for high-level performance metrics.
LastCalc is a powerful but easy to use web-based calculator.
MyMeeting is a Web application specifically designed to help you to better manage your decision meetings and get more out of them. Initially developed at the Open Source Competency Center (OSCC) MAMPU, it is the Malaysian government's first fully open source software.
OpenBooking is a derivative of the OpenSports project. It is a standalone web-based resource booking system, with all aspects administratable via the web interface. Simple, intuitive yet powerful - even includes a reporting system for management purposes.