Pooter is a modular, cross-platform PIM program with plugin architecture. It is coded in java and has been tested on Gnu\Linux, Windows, FreeBSD and MacOSX. See the web page for further details
Consultant Communicator (ConsultComm) is a small, lightweight, platform-independent program written in Java that allows anyone managing multiple projects, clients or tasks to effectively keep track of exactly how long they've spent on each project.
palm2ical is a Javaprogram that converts Palm databases as stored on Windows into ical/ics files per RFC 2445, and specifically for the Apple iCal product. Note that this is a one-way conversion; there is no support for synchronizing Palm databases.
Yet another alarms program with features as file modification alarm (maybe useful for security auditories), alarms file saving possibility and of course time and date alarms. This time written in java.
Doyen is a personal workflow management program. It can be used as a scheduler/todo list, but offers "flexible scheduling" features unavailable in most comparable programs, allowing you to specify that you want to work on a task, and then scheduling i
Info Sapient will be an Open Source, Common License 0.5, 100% Pure Java based program that is a mechanism for the expression and execution of business rules.
B-Itineris is a database program to keep track of train journeys on the Belgian NMBS/SNCB network. It allows to save detailed information about rolling stock, trains, lines, stops, journeys, etc. and generates comprehensive statistics.
Jump Scheduler is a program to help schedule and manage a sky-diving business. It will help manage plane loading, instructor scheduling, payout lists, and hopefully much more.