Hyper Estraier
This must be a pretty common scenario. Your company has a private intranet which is a cobbled together group of web servers, wikis, maybe Bugzilla if you do software development, maybe some CRM systems, inventory systems, databases with web front-ends and so on.
After a while everyone starts complaining that that can’t find the information they need. Nothing is structured, and there is no global search facility. What everyone craved was a google-like search for the private data the intranet.
This was becoming quite a problem at my place of work. Until I discovered Hyper Estraier. This is one of those delightfully terse pieces of software that is not only incredibly fast, but flexible enough that I am confident I can use it to index any intranet data we will have.