The GlassFish community is building free, open source, production-quality, enterprise software. The main deliverables are an Application Server, the Java EE 5 Reference Implementation, and the Java Persistence API Reference Implementation, TopLink Essentials. The community also delivers Maven Repository, tools and much more.
Now, here's something an enterprise can get a jump start on! I'll be looking into "The GlassFish" throughout March to see its benefits and application.