WPS: WebSphere Process Server

$ What is WebSphere Process Server?

Service Oriented Architecture provides you with the ability to develop and modify integration applications dynamically. It also lets you integrate existing applications with newer applications, so that they work together transparently. You can use WebSphere Process Server to develop and execute standards-based, component-based business integration applications in a Service Oriented Architecture.

Reference : 

http://www.ibm.com/developerworks/websphere/library/techarticles/0509_kulhanek/0509_kulhanek.html