Tolkien Gateway
- A J.R.R. Tolkien encyclopedia.
- http://tolkiengateway.net/

BobMoCo Middle-Earth Glossary
- Glossary of names, places and other terms for The Hobbit, Lord of The Rings, The Silmarillion and Unfinished Tales.
- http://web.ukonline.co.uk/rwf.downing/index.htm

Wikipedia: Middle-earth
- Article with sections on the continent's geography, peoples, languages and history.
- http://en.wikipedia.org/wiki/Middle-earth

From Middle-earth to Mithlond
- Dedicated to the life and works of Tolkien.
- http://www.btinternet.com/~p_cooper/index.htm

The Thain's Book
- Descriptions of the people, places and things of Tolkien's Middle-earth in The Hobbit and The Lord of the Rings.
- http://www.tuckborough.net/

Annals of Arda
- Glossary of the names, places, objects and thoughts of Middle-earth.
- http://www.annalsofarda.dk/

Galadriel Worshippers' Army
- Listings and detailed information for the major female characters.
- http://www.galadriel.org/

Encyclopedia of Arda
- An evolving encyclopedia, complete with illustrations, maps and an interactive chronicle.
- http://www.glyphweb.com/arda/

The Electronic Tolkien Encyclopedia Project:
- Scholarly articles submitted by visitors about Middle-earth topics.
- http://www.tolkienonline.de/etep/