A9

Amazon.com's A9 search offers a number of integrated features distinct from traditional search and portal solutions, as well as a very clean and eye-friendly interface. Searches can be saved in an extensive history, and any search can be called directly from a browser's URL field.

More information about them, from the website:

Our Product and Visual Search technologies continue to set the standard in helping people find the products they want, whether online or in the mobile space.

...and...

We've powered Product Search on Amazon.com and other top e-commerce sites, serving results to millions of customers each day. Our search technologies leverage rich data and deliver the most powerful product search available in online shopping.

Search results are powered by Google, and addons include Amazon.com book listing results.

Visit A9.com