dtSearch - INSTANTLY SEARCH TERABYTES OF TEXT on your Windows Web Server
25+ metadata and full-text search options, including highlighted hits Spider supports local and remote web data; dtSearchs own document filters support Office, PDF, HTML, XML, ZIP, emails (with nested attachments), and many other data types
dtSearch.com site offers hundreds of reviews and case studies available, as well as fully-functional evaluations.
(Developers: see dtSearch Engine listing for APIs for C++, Java, NET, SQL, etc.; and SDKs for multiple platforms.)
Note: Each physical machine, including all load balancing, backup, testing and development machines, counts as a server for licensing. ***Technical support covers dtSearch Web with Spider only. Technical support does not cover C++, Java, COM, .NET and other APIs.*** (Requires IIS)