American Hiking Society.
Includes information on trail conservation advocacy, hiking events, and topics such as hiking safety.

The Trail Database.
Bills itself as the world's largest hiking trail database. Contains over 2,000 links to hiking sites in Europe, North and South America, Africa, Asia and the Pacific.

Volksmarch and Walking Index.
Event calendar by state and country; clubs; New Walker Program; stories and articles on walking, and more.