GDBI is a genealogy program integrator. It includes an editor and the lifelines report language. It interfaces to multiple GEDCOM databases and is most popular as a PhpGedView client. At the core is a Java API to simplify adding databases and editors.
DracMan is a game based on the old and fun game of PacMan with a Dracula-theme. Plays in any Java-enabled browser and is quite fun! The game is in Swedish, but that should not stop non-English speaking people from playing since it's not that much text.
Ever wanted to be able to open a document in an X11 application by simply double-clicking it from the Finder? By default XLaunch-O-Matic is able to open documents with gv (.ps files) gimp (.xpm files) texmacs (.tex files) and more
Nular Shell is an SWT Java application that provides a slim GUI front-end for the Swedish web community Lunarstorm. It is based on easy-to-use classes to allow others to easily build other application utilizing the different functions on Lunarstorm.
Mathematics, linear algebra and optimisation
oj! Algorithms - ojAlgo - is Open Source Java code that has to do with mathematics, linear algebra and optimisation; particularly (but certainly not exclusively) suitable for the financial domain.