The best open source alternative to Garmin Connect is GPXSee, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Garmin Connect and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Garmin Connect are RunnerUp (Free, Open Source), FitoTrack (Free, Open Source), ForRunners (Free, Open Source) and Pytrainer (Free, Open Source).
FitoTrack is a mobile app for logging and viewing your workouts. Whether you’re running, cycling or hiking, FitoTrack will show you the most important information, with detailed charts and statistics. It is open-source and completely ad-free.Features:
Pytrainer is a tool to log all your sport excursion coming from GPS devices (with a focus on Garmin ForeRunnner 205, 305 and 405) or GPX files. Pytrainer supports GPS track files and displays your data in graphs and maps.
Android Activity Tracker is a GPS-tracking application for tracking sportive activities, with emphasis on cycling. It uses MapsForge to display map tiles and off-line maps from the OpenStreetMap project.
Turtle Sport is an open source software developed to communicate with GPS devices : Garmin, Suunto, etc. The following functions are available: Retreive your activities from GPS devices. Import and export activities in GPX, hst, tcx, kml, fit.