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A list of available tile servers for OpenStreeMap can be found here. More tile servers and URLs can also be found https://www.xyht.com/spatial-itgis/using-openstreetmap-basemaps-qgis-3-0/.
It's also possible to set up and run an on premise OSM tile server.
https://[abc].tile.openstreetmap.org/${z}/${x}/${y}.pngURL with alternative styles:
https://tile.memomaps.de/tilegen/{z}/{x}/{y}.pngThe list of tile map server on https://wiki.openstreetmap.org/wiki/Tile_servers has also some “useful” overlay map layers (e.g. transport or sea markers).
http://tile.memomaps.de/tilegen/${z}/${x}/${y}.png)A list of available tile server can be found https://wiki.openstreetmap.org/wiki/Raster_tile_providers. Some of the listed servers require a paid subscription and some might no longer be operational.
http://tile.thunderforest.com/cycle/${z}/${x}/${y}.pnghttps://tiles.openseamap.org/seamark/${z}/${x}/${y}.pnghttp://your-server:3650/api/tiles/your_map_id/${z}/${x}/${y}; with “maptiler-satellite-lowres” as an example for your_map_idIf you want you use the Web Map Service with MapTiler see GeoServer