What is best and most active open source .Net search technology?

Question

I'm trying to decide on an open source search/indexing technology for a .Net project. It seems like the standard out there for Java projects is Lucene, but as far as .Net is concerned, the Lucene.Net project seems to be pretty inactive. Is this still the best option out there? Or are there other viable alternatives?

question from:https://stackoverflow.com/questions/1257984/what-is-best-and-most-active-open-source-net-search-technology