There is also the MapTiler OMT style for OpenMapTiles, which uses Vector Tiles. It is a close copy of the Standard OSM map style. It appeared at the same time as Shortbread on the osm.org website.
There is no in-built routing with MapLibre and MapTiler yet, but you can easily integrate something like openRouteService (https://openrouteservice.org/) in combination with them to get great interface/base maps/routes inexpensively.