2.JBoss is the result of the joint efforts of developers all over the world, and it is an open source application server based on J2EE. Because JBoss code follows the LGPL license, you can use it for free in any commercial application without paying any fees.
3.WebLogic is an applicationserver produced by bea Company in America, specifically a middleware based on j2ee architecture. Webserver is a necessary software for building websites, which is developed in pure java.
4.WebSphere is the most important software platform in the on-demand e-commerce era. It enables your company to develop, deploy and integrate a new generation of e-commerce applications, such as B2B e-commerce, and supports business applications ranging from simple web content publishing to enterprise-level transaction processing.