OpenTrails

OpenTrails is a free, community-driven platform for hikers and outdoor enthusiasts. It allows users to:
Discover detailed hiking, trail‑running, and biking routes submitted by other adventurers
Share your own experiences, including GPS‑tracked routes, photos, tips, and difficulty ratings
Explore trails globally with an easy web interface—they position themselves as “Hike, Share, Repeat”

It’s similar in concept to platforms like AllTrails—but without paywalls or premium tiers (OpenTrails is completely free and emphasizes community and openness) .