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SpringSource, the people behind the Spring Framework, have today released an upgrade to the SpringSource Tool Suite.

Version 2.6.1 of SpringSource Tool Suite provides support for vFabric tcServer 2.5.  vFabric tcServer is described as "an enterprise version of Apache Tomcat, the widely adopted application server. Optimized for Java Spring users, with a lightweight footprint, vFabric tc Server is ideally suited for usage in modern virtual environments."
Full release notes for STS can be downloaded from here.
STS can be upgraded from within the toolsuite itself if you have a previous version, or downloaded from SpringSource.com.  vFabric tcServer developer edition can be downloaded from VMWare.