Free open-source SQL full-text search engine

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Features high indexing speed (upto 10 MB/sec on modern CPUs) high search speed (avg query is under 0.1 sec on 2-4 GB text collections) high scalability (upto 100 GB of text, upto 100 M documents on a single CPU) supports distributed searching (since v.0.9.6) supports MySQL natively (MyISAM and InnoDB tables are both supported) supports phrase searching supports phrase proximity ranking, providing good relevance supports English and Russian stemming supports any number of document fields (weights can be changed on the fly) supports document groups supports stopwords supports different search modes ("match all", "match phrase" and "match any" as of v.0.9.5) generic XML interface which grealy simplifies custom integration pure-PHP (ie. NO module compiling etc) searchd client API