- Catholic Encyclopedia
- An encyclopedia related to matters involving the Catholic relision. This is a broad area, with much historical and biographical information about many, many related things.
- An online encyclopedia that covers technology and all things related to computer technology and the Web. Very thorough and complete, with links back and forth between many concepts and topics.
- Britannica (Free Version)
- The free version contains advertising and is pretty busy, but worth a visit due to the high quality and selection of Web links.
- Encarta Encyclopedia (Free Version)
- This is a scaled down version of the commercial version, but still worth checking if you don't have access to a full version.
- Encyclopaedia of British History
- A wonderful historical encyclopedia created in Great Britain, and made freely available on the Web by Spartacus Publishing Company.
- HyperHistory Online
- "HyperHistory presents 3'000 years of world history with a combination of colorful graphics, lifelines, timelines, and maps."
- Infoplease Encyclopedia and Dictionary
- A combined small encyclopedia and dictionary.
- LetsFindOut Kids Encyclopedia
- If the other encyclopedias are over your head, you may want to give this one a try, designed for the younger student.
- Time-Life plant Encyclopedia (The Virtual Garden)
- "Looking for a plant, houseplant, tree, or shrub? This searchable database contains almost 3,000 species selected for general use in North American horticultural practice."