I'm working on something that is best described as Komoot meets Mastodon. Self hostable and federated. It's pretty early, and the UX is pretty bare bones still.
If you're keen on checking it out you should be able to find it in my recent Github contributions, following the link in my profile.
The difference is the planning, I'm building my tool around a collaborative use case. I'm often doing multi day bikepacking trips with my close friends. The planner supports real time collaboration, so multiple people can plan on the same route together.
Also for me it's an experiment in AI driven development (which I hope won't alienate people to much).
There is a federated application called Endurain [0] that can be self-hosted, and is compatible with Strava and Garmin Connect. Not a phone app, but a web front-end. I don't know how well that works on mobile.
You can record tracks with (I think) both Organic Maps and CoMaps. If you are interested in the social aspects of sharing tracks https://wanderer.to/ and a few others offer imports of GPX and other track formats.
Track recording in comaps is super finicky, at least for me. I’ve lost multiple recordings while checking the map mid hike.
I can’t say what the exact cause is. Should probably work that out. But I’ve taken to recording using it and all trails at the at the same time with plans to bring the missing data over to comaps at some point.
I just go on Wikiloc to find tracks, then export the GPX file into CoMaps. I know that Wikiloc is not OSS, but at least I can do navigation with custom routes that way.
If you're keen on checking it out you should be able to find it in my recent Github contributions, following the link in my profile.