The closest i know is a selfhosted strava clone called Endurain- https://docs.endurain.com/ I have not had time to look into it yet so im not sure what it is build on.

I use FitoTrack, seems to track walking/running the best. Haven't tried it with other workout types though

I use FitoTrack, which I found on FDroid. It's reliant on third parties (Mastodon, etc) for sharing, but it does all that.

I use wanderer.

It works fairly well to document and organize my hikes.

This would be pretty cool, if you build it I'll come :)

I moved away from Strava when they first started putting stuff behind a paywall, and just keep everything inside Garmin. But can't stand that they've come up with connect+ BS

I like RunnerUp on Fdroid

I’m not remembering the exact name, but there is a self hosted “FindMy” alternative type thing. I’m pretty sure it includes breadcrumb style tracking and a whole bunch of other datapoints. Could probably just reference the csv from an interface designed for runners.

No quite Fedi, but could be incorporated…