Outdoorsy - Find the best RV rental
Campnab - Nab that sold-out campsite!
LendList - Never again forget what you borrowed from someone and keep track of what your friends borrowed from you (Android app). - raphaelm/lendlist
Hipcamp - Book unique camping experiences on over 300,000 campsites, cabins, RV parks, public parks and more.
Who Has My Stuff - undefined
Campflare - Get notified when there are campsites open at your favorite campground. Its free.