- Alexa Internet – Alexa Internet, Inc. is a California-based subsidiary company of Amazon.com that is best known for operating a website that provides information on web traffic to other websites.
- Ask.com (formerly Ask Jeeves) – Ask.com is a search engine started in 1996 by Garrett Gruener and David Warthen in Berkeley, California.
- Baidu (Chinese) – Baidu is the leading Chinese search engine for websites, audio files, and images. Baidu offers 57 search and community services including an online collaboratively-built encyclopedia (Baidu Baike)
- Cuil - is a search engine that organizes web pages by content and displays relatively long entries along with thumbnail pictures for many results.
- Exalead (French) – Exalead is a French search engine involved in the Quaero project.
- Google – Google search is a Web search engine owned by Google, Inc., and is the most used search engine on the Web. Google receives several hundred million queries each day through its various services.
- Live Search (formerly MSN Search) – Live Search (formerly Windows Live Search and MSN Search) is the name of Microsoft’s web search engine, designed to compete with the industry leaders Google and Yahoo!.
- Sogou (Chinese) – Sogou is a Chinese search engine which can search text, images, music, and maps. It was launched 4 August 2004 and is owned by Sohu, Inc., SoGou means “Search Dog” in Chinese.
- Sohu (Chinese) – is a search engine company based in the People’s Republic of China. This company and its subsidiaries offer advertising, a search engine, on-line multiplayer gaming and other services.
- Wikia Search – Wikia Search is a free and open-source Web search engine and a part of Wikia (originally Wikicities) operated by Wikia, Inc.
- Yahoo! Search – Yahoo! Search is a web search engine, owned by Yahoo!, Inc. and is currently the second largest search engine on the web, after its competitor Google.
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