JBoss Application Platform has 2 distributions, a community and an enterprise release, community releases are like Beta releases of enterprise releases, JBoss 7.0 is then ac
I think the answer is: sort of. You can obtain the binary version of the latest JBoss EAP 6.1.0.Alpha if you agree to a $0 developer license and agree to use it only for development purposes. You do not get patches or support, however.
Also, it's open sourced under the LGPL in which case you don't have to agree to anything beyond the LGPL. But then the trick is getting the source. And you won't be getting the patched source. An important consideration here is that the binary package is configured carefully (e.g. with respect to security defaults) whereas you're on your own if you compile it from available source.
Bottom line: buy a license if you are using it for any important commercial purpose so as not to be at some arbitrary fixed point in the source's evolution.