How to load single .img files to Mapsource
Routable OSM map of Bulgaria by All_in_one_Garmin_Map
Basic routable OSM map of Iceland by Team OID
Very nice and completely routable maps based on OSM data by Lambertus
Routable OSM bike map of Norway by VeloMap
This is a collection of nice topographic maps from Afghanistan. They feature roads, rivers, settlements, POIs and contour lines. They also provide english transliteration of the names.