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Wikipedia is a Web-based, free-content encyclopedia written collaboratively by volunteers and sponsored by the non-profit Wikimedia Foundation. It contains entries both on traditional encyclopedic topics and on almanac, gazetteer, and current events topics. Its purpose is to create and distribute a free international encyclopedia in as many languages as possible. Wikipedia is the most popular reference site on the internet, receiving tens of millions hits per day.

 Find Wikipedia® articles in every language instantaneously.

Students, we find sources for your essay, so you don't have to. We find similar sentences to those in Wikipedia, complete with their citations for you to paste into your essay. It's the easy way to branch off to find authoritative sources and relevant quotes to deepen your research.

the peer-reviewed open-access encyclopedia written by scholars from all around the world. Scholarpedia feels and looks like Wikipedia -- the free encyclopedia that anyone can edit. Indeed, both are powered by the same program -- MediaWiki. Both allow visitors to review and modify articles simply by clicking on the edit this article link.

A new way to explore the World, right click on Google map and get the World information from Wikipedia

"DMOZ (from directory.mozilla.org, an earlier domain name) was a multilingual open-content directory of World Wide Web links. The site and community who maintained it were also known as the Open Directory Project (ODP). It was owned by AOL but constructed and maintained by a community of volunteer editors."

C-Link is new search tool for finding related and possibly unknown concepts that lie on a path between two known concepts. A demo of C-Link available here is set up to search Wikipedia with the ability to export your search to CMap. If you are interested in using C-Link to search other databases or repositories, please contact the project team.

Discovery Hub is an exploratory search engine built on top of the famous encyclopedia on the web, Wikipedia. The exploratory search is a new way to search the web, not to find what you are searching, but to find what you are not searching, and might be intersting for ...

"Highlight words, find instant results from Google, Wikipedia, YouTube, and Amazon, and share with friends."

Powerset finds articles related to the meaning of your query. And sometimes even direct answers.

A web search engine is designed to search for information on the World Wide Web and FTP servers. The search results are generally presented in a list of results and are often called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.

A metasearch engine is a search tool[1] that sends user requests to several other search engines and/or databases and aggregates the results into a single list or displays them according to their source. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously. Metasearch engines operate on the premise that the Web is too large for any one search engine to index it all and that more comprehensive search results can be obtained by combining the results from several search engines. This also may save the user from having to use multiple search engines separately.