Any recommendations on intranet search engines?

I’m considering three:

http://lucene.apache.org/ <http://www.opensearchserver.com/>

http://sphinxsearch.com/

http://www.opensearchserver.com/



I had been running MnogoSearch since the 90’s when it was called
UDMsearch.  Compiling their latest from source, won’t talk to current
versions of MySQL or Postgresql.  I did get binary package to work with
MySQL: the indexer populates 29 tables, but search interface
complains:  *Inverted
word index not found. *Their web board is “Busy” and emails get bounced.
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