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Vertical search engines retrieve data that is publicly available on the Web but cannot be reliably crawled and ranked by traditional horizontal search engines because it is only reachable by submitting Web forms. Thousands of vertical search engines have been created over the last few years, but it is difficult for users to find them.

The latest version of Noflail Search, released on June 10, 2010 has added a Search Engines panel that contains a list of vertical and horizontal search engines. You can use the list to discover search engines, and you can run the same query on different search engines by clicking on their entries in the panel. Noflail Search is available at

A short short video tutorial is hosted on YouTube.

The list of search engines in Noflai Search is organized using self-explanatory tags, and displayed hierarchically. Noflail Search uses a novel method of browsing hierarchical data, described in the following white paper:

Noflail Search has several unique features. It lets you interleave the browsing of multiple result sets to solve difficult search problems, and it provides cooperative responses to queries that produce no results.

The following white paper has background information on cooperative responses:

and the following technical report describes and analyzes the algorithm used by Noflail Search to compute cooperative responses: A presentation related to Noflail Search was made at the 2009 Search Engine Meeting. You can find a PDF file containing the presentation at the meeting Web site, or you can download here the following: More details on Noflail Search can be found in the white papers:
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