Breakbulk is a project mainly written in JAVA and JAVASCRIPT, it's free.
Snapshot of openanzo, the opensource codebase we built up at Cambridge Semantics. It's all semantic web stuff: RDF, sparql, OWL, and a bunch of client/server stuff.
This is a fork of the open anzo project I worked on long ago. I put it on github largely to make the code base easily accessible.