JBoss AS (Application Server) is the open source version of JBoss and JBoss EAP (Enterprise Application Platform) is the commercial version. Versions of the two coincided until later releases; JBoss 6 EAP is the commercial equivalent of JBoss 7 AS.
The JBoss applications server is a J2EE platform for developing and deploying enterprise Java applications, Web applications and services, and portals. J2EE allows the use of standardized modular components and enables the Java platform to handle many aspects of programming automatically. A beta version of JEMS is now available on Amazon's cloud service EC2.