Java Script - Wirable Libraries

http://dev.lshift.net/james/wireit/wireit/

Wire It 0.5.0 Presentation from neyric

Jsplumb 

http://jsplumbtoolkit.com/jquery/demo.html

Ajax Mashup Development Platform

http://www.afrous.com/en/ 

WireCloud

https://github.com/Wirecloud/wirecloud