25+ metadata and full-text search options with highlighted hits
Numerous advanced data classification options, including faceted search dtSearchs own document filters support Office, PDF, HTML, XML, ZIP, emails (with nested attachments), and many other data types; supports SQL and similar databases
Spider adds local and remote web data
C++, Java and .NET APIs
dtSearch Engine also available for multiple other platforms.
See dtSearch.com site for hundreds of reviews and case studies available; articles on faceted search, MS Azure, etc.; and fully-functional evaluations.
Server definition: License covers usage in a single organization. Each physical machine, including all load balancing, backup, testing and development machines, counts as a server for licensing. In a cloud-based environment like Microsoft Azure, each instance counts as a server for licensing. Includes C++, Java, COM and .NET developer APIs. (Also includes dtSearch Web with Spider as an IIS deployment option.)