Android

Openfietsmap can be rendered on a few apps for Androïd mobile devices:

For the Androïd app OSMAND there is an Openfietsmap render style available.

For mobile devices (smartphones, tablets) the Oruxmaps (Android) is the only app that is compatible with Garmin img tiles.

Locus maps

Locus was working on implementing the Garmin img format into their map app, not sure how the development is nowadays.

Please let me know if you know more.

OSM Generic from garmin.openstreetmap.nl in Locus