tools open source to help in search

Please Can you give me the name of tools open sourc开发者_如何学Goe witch can help somebody to search some information like google .

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Lucene is a text indexing and searching library. Maybe you would like to start from that. It is available atleast for java and .net

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I'd suggest you to take a loot at Sphinx Search

It is great for full text search, at ast we have used it for archives of a daily newspaper and it was pretty successful.

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Lucene, Nutch (based on Lucene), mnogo search, Sphinx, Xapian, ht::dig, ::egother, zettair, terrier.....

Google offer Sitesearch a search service which is relatively cheap - but neither software nor open source

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I'd suggest you to use Sphider. It's free, has "did you mean?" function too. You can set number of subpages and links it will menshion in the URL. Very useful thing.