IndexTank - Search Engine powers Reddit
IndexTank search engine powers search in Reddit, Social bookmarking site. IndexTank is acquired by LinkedIn and released the project as open source. It includes features like Variables boosts, Facets, Faceted search, Snippeting, Custom scoring functions, Suggest, and Autocomplete.
Homepage: http://indextank.com/
https://github.com/linkedin/indextank-engine
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