vtm VS ActivityLog2

You are correct, Valhalla is used for routing. Maps are rendered on the ELEMNT, BOLT and ROAM with mapsforge, BOLT2 with vtm. To look at map files there is cruiser cruiser (mapsforge) and cruiser-gl (vtm). Create updated maps with wahooMapsCreator. There is also some documentation how to add POI's or make a custom theme.

for an example. It's perfectly smooth. The application is closed source but the underlying renderer (VTM) is LGPL3. The renderer, https://github.com/mapsforge/vtm, is basically an OpenGL alternative for the mapsforge offline maps format and maintained by the same guy (the original mapsforge renderer is arguably a bit slow, struggling to hide its slowness behind cached tile bitmaps).

I use ActivityLog2 which also reads FIT files.

https://github.com/alex-hhh/ActivityLog2/releases

Don’t believe me? Check out the interactive gui stuff at https://alex-hhh.github.io

Check out this guy's page I just came across here. He's got a bunch of gui based Racket applications that look really cool.

I use and like Activity Log 2 - https://github.com/alex-hhh/ActivityLog2. You can import most common file formats like TCX, GPX and FIT.

This https://github.com/alex-hhh/ActivityLog2 works quite well for FIT files on desktop.

If you just want to track your workout data, there are far better softwares/websites to do it, I mean strict data analysis. As you don't give something to social part, could be great. GoldenCheetah , Github-ActivityLog2, TrainingPeaks:WKO5, Runalyze

As suggested I can record my activities from my watch/bikecomputer, and sync later, there are some apps who is kinda nice: GoldenCheetah, Runalyze, TrainingPeaks/WKO, Github: ActivityLog2, but I have not found a own-private-local cloud solution... OsmAnd+ and LocusMap are doing a good recording job as well, have not check if those recorded track/activity can be shared/transfered easily on a owncloud.