After working in one of the biggest networking giant for 4+ years I had access to the IBM RAD as a pseudo right in my desktop and that provided me an oppurtunity to work with Websphere Application Serverintensively. Once I am out of that project I had to work on different non-WAS target platforms like Tomcat and liferay. One thing I did not want to loose is association with Websphere environment.
After surfing through the IBM download site, it did not take much time to notice that IBM offers no-charge distribution of Websphere Application Server for download for developers. https://www.ibm.com/developerworks/mydeveloperworks/blogs/wasdev/entry/download_was4d?lang=en
Eclipse for J2EE environment can be downloaded at http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/junor
Eclipse J2EE IDS comes by default with the Tomcat server for development. To integrate this eclipse IDE with Websphere Application Server search developor Tools in Eclipse Market Place for the correct
Websphere application server tool as in link below:
WAS 8.5 - http://marketplace.eclipse.org/content/ibm-websphere-application-server-v85-developer-tools
PS: As it is indicated above this WAS server/ tools is a Developer install and meant to be used for development and unit testing in developer systems.