Project setup Guide : Garmin-Grafana on Github
Although not the easiest to set up, It offers a lot of customization and integrates well with existing home lab setups, while being fully free and open source and transparent. The project README has an extensive documentation. Unlike Strava or other similar application tracking only recorded exercises, this project can extract everything garmin watches collect, including raw HR, sleep scores, HRV, Steps, Breathing rate, SpO2 and all.
