The GlassFish community is building free, open source, production-quality, enterprise software. The main deliverable is a production-quality Application Server that is also the Java EE 6 Reference Implementation.
There are 2 ongoing releases of the GlassFish AppServer. GlassFish v2 is in production and supports Java EE 5 with clustering and failover. GlassFish v3 adds a modular architecture with a very small kernel. The 3.1.2 release that supports Java EE 6 with clustering, is in production, and the 4.0 release, which will be the Java EE 7 reference implementation, is under development.
TheAquarium (http://blogs.sun.com/theaquarium) reports on activity in the community.