We always welcome additional community involvement for any of our projects at Fogbeam Labs. Yes, we're a company and hoping to profit from our OSS work in time, but everything is ALv2 licensed, developed in the open, in true community fashion, not Android style "throw it over the wall" whatever. Code is all on Github.
Most of our code is in Groovy, some stuff is Java. Future stuff might include anything from Clojure or Scala to R, or C++ or Julia.
Quoddy - an enterprise social network. To use an analogy "Facebook for the enterprise" - but so much more. https://github.com/fogbeam/Quoddy
Neddick - an information discovery platform. To use an analogy, think "Reddit for the enterprise". https://github.com/fogbeam/Neddick
Heceta - a search engine. Think Solr + ManifoldCF + (some other stuff for social search and semantic search). You could say the idea here is to bring the Linked Data approach inside the enterprise.
I can't promise anything definite, but as with any commercially backed open source project, the possibility is always open that if somebody contributes to the project and kicks ass, that we may be able to find (or create) a spot for that person at Fogbeam at some point.
All commercial notions aside, we are working on some wicked cool stuff, especially the semantic web stuff, and would welcome anybody who wants to get involved. At worst, we'll all learn some stuff and have some fun together.