We've just completed certification of tc Server and the AMS Agent for AIX 5.3 and 6.1. This certification did require a small number of modifications to adapt to the nuances of the IBM JVM so you will need to download the AIX bundle if interested in AIX.

Current supported platforms can be found at:
http://static.springsource.com/proje...gssupplat.html

Evaluation downloads can be found at:
http://www.springsource.com/products...-60-evaluation

And commercial users can log in to their accounts and access licensed subscription downloads from:
http://www.springsource.com/spring_account