Central Texas Trail Tamers
- Helps build and maintain trails. Includes schedule and reports of past work.
- http://www.trailtamers.org/

Austin Explorer
- Dedicated to the exploration of Austin and its surrounding area, concentrating on little known parts of the hill country. Contains an event listing, public forum, and hiking reports.
- http://www.austinexplorer.com/

Hill Country Outdoors
- An outdoor and social club for singles and couples. Hiking, biking, and canoeing.
- http://www.hillcountryoutdoors.com

Adventuring Outdoors
- Calendar and membership information for Austin's gay and lesbian volunteer organization for the outdoor enthusiast.
- http://www.main.org/adventuring/