Britannica Encyclopaedia, Inc., headquartered in Chicago, Illinois, is a leading provider of learning and knowledge products. We're proud to be one of the world's most trusted sources of information on every topic imaginable. The online encyclopedia version of Britannica includes free downloadable and online games, RSS feeds and widgets, an online store, premium memberships and lots more.

Reference.com is a multi-source encyclopedia search service produced by Dictionary.com, a leading provider of language reference products and services on the Internet. Free language tools and services includes, dictionaries, free translators, fun and games, free word puzzles and many word usage tools to name a few.

Since 1995, Refdesk is a free, family friendly website that indexes and reviews quality, credible, and current web-based reference resources. Refdesk has three goals, fast access, intuitive and easy navigation and comprehensive content, rationally indexed. The underlying philosophy here is simplicity to information.

Wikipedia is a multilingual, Web-based, free-content encyclopedia project, providing links to guide the user to related pages with additional information. Since its creation in 2001, Wikipedia has grown rapidly into one of the largest reference web sites, attracting around 65 million visitors monthly as of 2009 with features including the Wikipedia reference desk and a community portal.

Infoplease is a comprehensive reference source that combines an encyclopedia, a dictionary, an atlas and several almanacs together with statistics, facts, and historical records. A single search engine on Infoplease allows you to search all these sources at once. The Infoplease electronic database is continuously updated and expanded by a team of reference, entertainment, and sports editors.

Library Spot provides a free virtual library resource center, simplifying the search for the best library and reference resources on the web for educators and students, librarians and just about anyone exploring the web for valuable research information. We created LibrarySpot.com to bring the best library and reference sites together in one user-friendly spot. Websites featured on LibrarySpot.com are hand-selected and reviewed for their exceptional quality and content.

The Internet Public Library (IPL) was the first public library of and for the Internet community and is now a global source for the information community. The Internet Public Library will shape and direct the evolving role of libraries in an increasingly digital world while working to become a virtual learning laboratory for the study of information services and technology.

The Free Library is an invaluable research tool and the fastest way to locate useful information on virtually any topic. Since 2003, The Free Library has offered free, full-text versions of classic literary works from hundreds of celebrated authors. The Free Library has been expanded to include a comprehensive collection of periodicals from leading publications including millions of articles dating back to 1984 as well as newly-published articles that are added to the website daily.

Answers.com is a free "one-stop source" with instant information on over 4 million topics. We deliver useful answers in an instant. Look up any word or phrase for the best definition or explanation on the Web. With 180 trusted titles from the most prestigious reference publishers, and we add our patented database technology to provide accurate answers to questions you require, not links or lists to possible answers.

A practical time zone calculator which you can customize to your own preferences. It will automatically use the current time for your location and calculate the time difference in hours relative to GMT/UTC and six other cities in different time zone locations. You can select other cites from a drop-down menu to give local time there and relative to you and to GMT/UTC.

Wikisource is an online library of free content publications, featuring some 130 thousand pages of indexed works by noted authors. Contributors by volunteers are collected, organized and proofread to illustrate and annotate English-language source texts. Main categories and sub-divided by authors and by works.

Freebase is an open database created by Metaweb Technologies. It is built by the community and for the community. Freebase draws from large open data sets such as Wikipedia. By structuring the world’s data in this manner, the Freebase community is creating a global resource that will one day allow people and machines everywhere to access information far more easily and quickly than they can today.

eCalc is a free online calculator that supports many advanced calculator features you would expect on a scientific calculator including unit conversion for converting common measurements, equation solving, and even complex-number math. The calculator is designed to work directly in your browser and requires no special plug-ins.