used to describe a search engine so that it can be used by search client applications and to extend existing syndication formats such as RSS and Atom to return search results.
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a web administration interface. It runs in a Java servlet container such as T
eTBLAST is a unique search engine for searching biomedical literature. it lets you input an entire paragraph and returns MEDLINE abstracts that are similar to it.
a novel browsing interface designed for freebase, an open database of the world’s information, including Wikipedia, MusicBrainz, and the SEC archives...
DBpedia is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia, and to link other data sets on the Web to Wikipedia data.
PeerSpective uses the shared interest between you and your friends to help guide Web search. When you run a Google search, PeerSpective includes extra results which may be relevant to your question alongside the results from Google
The current discovery catalog is temporary, pending the release of a permanent catalog that is being developed by OCLC in conjunction with the HathiTrust partners.
The Next Web Search is devoted to all things search related and is edited by Charles S. Knight, former editor of the blog AltSearchEngines and publisher of over 4,000 posts about alternative search engines.