Found via SearchEngineBlog:
You don't hear the word "free" much in the enterprise space. It's all license per seat, support contracts, etc.However, IBM (remember them?) and Yahoo have teamed up to provide free enterprise search software. You can download your own copy here.
IBM have, of course, been a major player in the enterprise space for a very long time. This hook up with Yahoo makes a great deal of sense, for both companies.