American Whitewater Association
An excellent source of data for locating boatable rivers as well as navigation and access information on each.
Additionally, AW is a solid source for information and history surrounding riparian policy and access issues.
A community run website featuring forums on equipment, techniques and paddling locations. Also features a robust classifieds section for used gear. Primary focus is on whitewater, with other sections for surf and sea kayaking.
Focusing primarily on whitewater kayaking, Eddy Flower has a robust catalog of boats and gear to compare and contrast. An excellent source for finding out more information about a future boat purchase. River information section is still in development.
Geared towards the open boat or canoe enthusiast, C Boats is an online community featuring info and resources for canoe selection, repair and techniques.
A robust and comprehensive assemblage of photos, user reviewed information on routes and locations as well as articles on technique, training and equipment. Rockclimbing.com is one of the largest online communities for climbers of all disciplines.
Designed as a resource for finding and submitting information on routes all around the country, Supertopo features beta (that's climbing lingo for information about a climb) and down-loadable "topos" (maps of climbing areas and route diagrams) for many of the country's popular climbing destinations.
Encompassing data for both face climbing and mountaineering, Mountain Project is a wealth of user submitted knowledge and information on climbing areas around the country and around the world.
Want to know whether to pack a poncho on your upcoming trip to the crag? Check Climbing Weather for a forecast on all your favorite climbing destinations.
A magazine as well as an online community, Backpacking Light is a great resource for those looking to shed ounces in their packs. Reviews and a robust and active forum community offer loads of information on off-the-shelf products and DIY projects for the handy hiker.
Founded in 1892 by Yosemite advocate John Muir, the Sierra Club has long been a pillar of advocacy for the wild areas of North America. Their website is a superb resource for information and news on resource access and preservation issues. Sierra Club also offers opportunities to hit the trail with other members on club organized hikes.
A resource for many types of users, Red Trails offers basic trail information via a google maps interface as well as down-loadable way-point data in a few popular GPS formats and vertical profiles on most trails. Offering a NFS and NPS sourced trail data for the particulars, the route descriptions are community driven and participation is encouraged.
A non-profit, public-supported organization. Promotes mountain bicycling opportunities that are environment