The following tools provide free information on a variety of topics:
- AnyWho Online Directory (AT&T)
Locate telephone numbers and addresses for both businesses and people. Other notable features include maps, reverse lookups (enter the phone number and it will return the owner's name and address), a toll-free directory, and links to international directories.
- Calculators & Converters
Calculate the distance between two cities, perform metric conversions, calculate inflation, and more.
- CIA World Factbook
Unclassified since 1971, the Central Intelligence Agency's annual World Factbook provides a reliable resource for information on independent states, dependencies, areas of special sovereignty, uninhabitable regions, and oceans.
- Information Please Almanac
The online version contains all of the facts from the printed almanac, plus a dictionary and encyclopedia.
- Purdue Online Writing Lab (OWL)
The Purdue Online Writing Lab (OWL) offers over 200 free resources about writing, research, grammar, English as a Second Language, and professional writing.
Note: The American Library Association (ALA) has a list of the best free reference web sites.
Many other libraries and institutions have created lists of free databases.