Are there any alternative open source solutions (with a web console)?
Try this: http://www.flax.co.uk/
(I have no experience with this product or other enterprise search products).
Solr, from the Apache Lucene project. Excerpt from the web site
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, a web administration interface and many more features. It runs in a Java servlet container such as Tomcat.
Its not open source, but Microsoft Search 4.0 is free at this link
I would say its worth trying, I liked the formatting of the results returned, but the problem was the results would include documents a user could not access due to security. So it was no good for us since document names can contain restricted information too, such as "Bob-Warning Letter.doc"
I've found a solution with Google Desktop Search (Which can be used like a web appliance with a plugin): read more...