Most of the plug-in's are from standard IBM and Eclipse.org. Recent plug-in is Extension Library 8.5.2.201106040229NTF and there is one more plugin that Installed for pdf i.e. (U) PDF Plug-in version 1.0.2.2011010602 with Plug-in Id : dk.unionsoftware.updf.
I have no problem in client side validation at all. Please let me know, what other information you are looking for.