From the webpage:

Groonga is an open-source fulltext search engine and column store. It lets you write high-performance applications that requires fulltext search.

The latest release is 1.2.5, released 2011-08-29.

Most of the documentation is in Japanese so I can’t comment on it.

Think of this as an opportunity to (hopefully) learn some Japanese. Given the rate of computer science research in Japan it will not be wasted effort.

PS: If you already read Japanese, feel free to contribute some comments on Groonga.

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