Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
AllTrails - Explore over 50,000 trails, reviews, and photos. Share them…
Event Hunt - Startups and Tech Events Curated By Locals
Komoot - Plan Your Perfect Hiking, Mountain Biking or Road Biking Adventure
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Outdooractive - The digital home for experiencing the great outdoors