The National Science Digital Library (NSDL) NCore team has released an open source generic version of the NSDL Search, and the NDR Interactions MediaWiki extensions and WordPressMU plugins that power the NSDL Expert Voices blogosphere and NSDL Wiki. From the news release:
There are three packages to the NCore project on SourceForge. These are: 1) contentCache - the Nutch-based web crawler that stores page content for indexing and "best passages." 2) searchService (beta) - the applications that build and maintain the search index, along with the REST service used to access the index. 3) searchTools - common classes used by the other packages, and some utility applications for harvesting and parsing OAI.