Name: GPXsee
Project information: GPS log file viewer and analyzer with support for GPX, TCX, KML, FIT, IGC, NMEA, SLF, SML, LOC, GPI, GeoJSON and OziExplorer files.
Homepage: https://www.gpxsee.org/
License: GPL 3.0
Upstream has been contacted: Yes, but zero interest to maintain Flatpak release.