JBoss 4.0 Shows Raft of Improvements
The free app server blends open-source and commercial advantages in one product.
Many companies choose the JBoss application server because of its extreme ease of deployment (you basically just unpack it and run it) and because it runs on almost every operating system platform out there. ISVs like it because of its strong support for standards, and its modular design makes it ideal for embedding within other applications.
Click here to read the full review of JBoss AS 4.0.