However, there are many open source products that provide functionality of part of the WebSphere suite. For example, there is a well-known open source J2EE application server called JBoss. There are a number of open source Content Management Systems, including Zope.
If you're interested in some info on replacing the J2EE app server, I provide a case study in the webcast I recently did, Why your future depends on open source.
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