TripleA 0.6 has been released.
TripleA is an open source clone of various axis and allies style games. It supports network and PBEM play.
If you are interested in helping, developers are needed. An AI, game server and better graphics are all things that need work.
No web start version yet, but its in the todo list. Some changes in the way games are loaded has to be done first.
Sourceforge project page - http://sourceforge.net/projects/triplea
Home page - http://triplea.sourceforge.net/
Forums - http://maddlinks.com/triplea/