Sphinx is a full-text search engine, distributed under GPL version 2

Check out the home page: http://sphinxsearch.com/

sphinx needs mysql_config program, install it with:

sudo apt-get install libmysqlclient15-dev
wget http://sphinxsearch.com/downloads/sphinx-0.9.8.tar.gz
tar xvf sphinx-0.9.8.tar.gz && rm sphinx-0.9.8.tar.gz
cd sphinx-0.9.8
./configure
make
sudo make install