Which are the best alternatives to Lucene?

Question

-edit-

The question do not says it all. :)

It may run on Unix and it will be used for email searching (Dovecot, Postfix and maildir).

Lucene is not a problem, im just analyzing some alternatives.

Answer 1

The ones I can come up with now is native DBMS-full-text-indexing (MSSQL, MySQL both has implementations for it) aswell as Sphinx http://www.sphinxsearch.com/about.html

The advantage with Sphinx is easier integration with MySQL and PostgreSQL, however Lucene is more feature-rich.

Answer 2

There is a good discussion on slashdot.

Answer 3

Some alternative indexers are mentioned here:

http://stackoverflow.com/questions/120965/which-search-technology-to-use-with-asp-net

Answer 4

For simple things native full-text search of your RDBMS.

• Full text search in PostgreSQL
• FTS2 in SQLite
• Full text search in MySQL
• Oracle Text in Oracle DB

Answer 5

would need to know what problems you're having with Lucene, but Xapian is worth a look.

Answer 6

Minion from Sun Labs is a very interesting alternative to Lucene and Xapian.

Among other interesting features, it supports search results clustering.