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DDG is an entire search engine coded by one dude in Perl.DDG FAQ: Q. How do you get your results?
A. From many sources, including DuckDuckBot, crowd-sourced sites, BOSS & Bing.
E.g., see http://developer.yahoo.com/search/boss/ ...
BOSS (Build your Own Search Service) is Yahoo!'s open search web services platform. Developers, start-ups, and large Internet companies can use BOSS to build and launch web-scale search products that utilize the entire Yahoo! Search index.
BOSS (Build your Own Search Service) is a truly open API with as few rules and limitations as possible. With BOSS, developers and start-ups now have the technology and infrastructure to build next generation search solutions that can compete head-to-head with the principals in the search industry.