With Google Trends, you can compare the world's interest in your favorite topics. Enter up to five topics and see how often they've been searched on Google over time. Google Trends also shows how frequently your topics have appeared in Google News stories, and in which geographic regions people have searched for them most.

Enter a question or calculation and Wolfram|Alpha uses its built-in algorithms and data to get the answer. A huge set of information and tons of models, methods, and algorithms that make it possible to compute whatever can be computed about anything

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Query DNS domain name servers for information about host addresses, mail exchanges, name servers, and related information

Nolo's Law Dictionary contains plain-English information on many different legal topics

Search through over 70,000 articles of the Encyclopædia Britannica

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The Biographical Dictionary contains information on more than 28,000 notable men and women who have shaped our world from ancient times to the present day.

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Bartleby combines the best of both contemporary and classic quotations collections (over 86,000 entries), the largest of its kind ever compiled.

Encyclopedia of human knowledge written collaboratively by contributors around the world

Look up any word in Dictionary.com's meta dictionary

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Internet dictionary of slang words and phrases. More than 5 million street lingo words and expressions have been defined by the Internet community. The definitions on Urban Dictionary are meant to be those of slang or subculture words, phrases, and phenomena not found in standard dictionaries and tend to have the newest words. Entries are checked by volunteer editors and rated by site visitor…

ARIN's WHOIS service gives contact and registration information for IP addresses, autonomous system numbers (ASN), organizations or customers that are associated with these resources, and related Points of Contact (POC). It doesn't include information on domain names or military networks.