Looks like WSO2 which our CTO recommended, the thing I find with all these ESBs, is you don't want drag and drop, you want the moving parts of the system and understand them, not hide them all behind a TLA.
Thanks for your feedback re. drag and drop. We're looking for all the user feedback we can get, feel free to make use of the community forum as well: http://community.warewolf.io
Thanks again