Relief Maps - 3D GPS for outdoor sports
LendList - Never again forget what you borrowed from someone and keep track of what your friends borrowed from you (Android app). - raphaelm/lendlist
Catch & Release: Outdoorsman's Consignment - Niche app for the outdoors, sports & fitness enthusiast
You Borrowed It - Keep track of who borrowed what and when you can expect it back
Bullhorn - Bullhorn connects recruiters with employees in real time and helps companies with staffing.
Outdoorsy - Find the best RV rental