Title: XConq.
Developer: Stanley T. Shebs.
Version: 7.5pre
Development Status: Full Release.
Rating: 9/10.
Requirements: Windows, Mac, or Linux.
Site: http://xconq.sourceforge.net/
Description: An open source wargaming engine created over many, many years. Features include a large number of games including three World War II games, Korean War 2006, Ancient Near East, Peloponnessian War, Roman Civil War, Beirut 1982, Bellum Aeternum, and probably twenty to thirty more.
Features: AI, Editor, Multiple Diverse Campaigns.
Screenshot: