Gigablast

Founded in 2000, Matt Wells created Gigablast to index hundreds of billions of pages with the least amount of hardware possible.
Gigablast provides large-scale, high-performance, real-time information retrieval technology with services for partner sites.
The company offers a variety of features including topic generation and the ability to index multiple document formats.
This search delivery mechanism gives a partner "turn key" search capability and the capacity to instantly offer search at maximum scalability with minimum cost. Clients range from NASDAQ 100 listed corporations to boutique companies.
Gigablast is one of a handful of search engines in the United States that maintains its own searchable index of over a billion pages.

https://www.gigablast.com