Hissim is a history generator for WorldForge project. It uses simulation to create communities of creatures with realistic relationships and backgrounds. It's distributed with a threaded Tk interface and a simple globe viewer. Hissim can generate GEDCOM so you can edit its output with genealogy programs.
JGenea is an pure Java genealogy application useful to store information about the members of a family, the relationship between them, acts (birth, mariage, death, etc.), and photos. JGenea can import gedcom files from another applications and export all or part of your data to gedcom files, PDF files, patronymes/towns files, and backups.
GEDXchange is a collection of genealogy tools to work with GEDCOM 5.5 and GSF 2.0 files. These tools allow you to create and edit GEDCOM 5.5 Genealogical data files, create Web pages from GEDCOM 5.5 files, export data to GEDML, view contents of genealogical data in various ways, convert GSF 2.0 data format to GEDCOM 5.5, and validate GEDCOM 5.5 files.
Web Gedcom Viewer is a full Web-based Gedcom viewer that uses MySQL or SQLite on the backend and Perl as the frontend with templates for easy HTML manipulation. Gedcom files are in the standard format exported by family tree/genealogy applications such as Family Tree Maker or Personal Ancestory File. Plugging in different SQL types is a breeze, as all of the SQL statements are centralized to a single pm.
GenealogyJ is a full-featured standalone Java application that can handle all of your genealogic information. It provides different graphical components for working on your family tree and is GEDCOM compliant. It requires a Java 1.4 Virtual Machine and runs on Windows / Mac / Linux.