gpx.studio - View, create, edit and combine GPX files online to correct your activity data or design new awesome routes.
Cairn - Easily share outdoor trip plans and find cell coverage in the wilderness with the Cairn app.
GPX Editor - Load, modify and save your GPX 1.1 files.
Gaia GPS - Trail maps for all your adventures
GPS Track Editor - GPS Track Editor: Free Windows Application to Make GPS Tracks Better.
FarOut - The number #1 app for long distance hiking, biking, and paddling.