GPX Editor - Load, modify and save your GPX 1.1 files.
iFit – Workouts at Home - iFit – Workouts at Home app allows users to access an extensive collection of thousands of home workouts with advice and motivation from world-class fitness trainers.
gpx.studio - View, create, edit and combine GPX files online to correct your activity data or design new awesome routes.
Strava - The #1 app for runners and cyclists
GPS Track Editor - GPS Track Editor: Free Windows Application to Make GPS Tracks Better.
BitGym - Virtual Cardio Tours. No heart rate sensor of special hardware required.