Strava - The #1 app for runners and cyclists
GPX Editor - Load, modify and save your GPX 1.1 files.
RunKeeper - Join the community of over 45 million runners who make every run amazing with Runkeeper. Track your workouts and reach your fitness goals!
gpx.studio - View, create, edit and combine GPX files online to correct your activity data or design new awesome routes.
Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.
GPS Track Editor - GPS Track Editor: Free Windows Application to Make GPS Tracks Better.