After more than a year, GenealogyJ (GenJ) has been updated to version 2.4. GenealogyJ is a cross-platform genealogy application written in Java.
Official Description:
GenealogyJ is a viewer and editor for genealogic data, suitable for hobbyist, family historian and genealogy researcher. GenJ supports the Gedcom standard, is written in Java and offers many views like family tree, table, timeline, geography and more.
Download it from here (SourceForge) if you are curious.