OpenJazz
Discuss
OJ
News
You can use the news section to discuss any aspect of OpenJazz. However, it's not the best place to get support.
Github
If you have a Github account, you can raise and discuss issues there.
Forum Thread
There is a thread about OpenJazz at the JazzJackrabbit Community Forums. There are also separate threads for multiplayer and Jazz Jackrabbit 2 support.
Contact the project creator
Mail: alister_j_t@yahoo.com