Nutch

Before Nutch has become a sub-project of Lucene. There's a niche opportunity for the raw power of this unbiased search engine. Now that Knowledge Management has slowly, clearly defining itself not only in the "intelligence" community but for corporate uses as well. With Nutch and some little imagination, one can create, for one, is a Verity-style "federated" searches and indexing that is "C:drive" mountable or thru Samba or NFS, depending on the "federation", information can be presented in a folder structure, as a web portal and so forth. Tools can be built on top of Nutch to aggregate RSS Feeds, IMs, Blogs and even password-protected filesystems.

In fact, "knowledge"-snooping systems such as this, is very attractive to a lot people for very obvious reasons.