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search engines

Bing

Second most popular search engine in the United States developed by Microsoft.

bing.com

Google

Preeminent search engine indexing billions of pages.

google.com  |  Also see: Google Books, Google Scholar

Yahoo!

Widely used search engine powered by Bing.

search.yahoo.com

meta search engines

Carrot2

Open source meta search, clustering, and search visualization engine.

carrot2.org

DuckDuckGo

Search service with a clean interface and an emphasis on user privacy.

duckduckgo.com

Ixquick

Combines the top results of multiple engines--primarily Gigablast and Yandex.

ixquick.com

iSEEK

Clustering and meta search engine by Vantage Research.

iseek.com

Yippy

Meta search and semantic clustering engine by Vivisimo.

yippy.com

academic search engines

BASE

Operated by Bielefeld University Library, BASE provides an index of over 100M documents.

base-search.net

Instagrok

Innovative search service that surfaces key facts, relationships, and quizzes from results.

instagrok.com

RefSeek

Web and document search engine for students and researchers.

refseek.com  |  Also see: Document Search

ResearchGate

Search large volumes of self-published scientific research material.

researchgate.net

international search engines

Baidu

Leading search engine in China.

baidu.com/

Yandex

Russia's most popular search engine for web, news, and media.

yandex.com