[GEEKY] Cool open source product analogous to Yahoo Pipes
SnapLogic is an open source product (at least in it's base edition) providing tools to construct pipelines that deliver and process and filter information through collections of interconnected REST services.
As usual, they provide a free 'community' edition, and then variously priced developer and enterprise editions. Pricing wasn't indicated but if you have this kind of need, SnapLogic looks like it's worth a peek.