OpenTracks has support for Bluetooth LE (but not ANT+).
OpenTracks also supports visualizing several tracks on one map (requires either OSMAnd~ or Maps.ME as no map feature is build into OpenTracks).
Just select the recordings in the list and press the map button in the action bar.
For visualizing exported GPS tracks, you could use TheKarte: https://github.com/dennisguse/thekarte
It is a standalone JS-application and can be scripted via the URL parameters.
OpenTracks also supports visualizing several tracks on one map (requires either OSMAnd~ or Maps.ME as no map feature is build into OpenTracks). Just select the recordings in the list and press the map button in the action bar.
For visualizing exported GPS tracks, you could use TheKarte: https://github.com/dennisguse/thekarte It is a standalone JS-application and can be scripted via the URL parameters.