I have an admittedly resource-intensive, self-hosted, podman/docker-based slippy map product prototype. Briefly, it incorporates the nominatim geocoder, the valhalla routing engine, a map tiler, and PostGIS. One of its front-ends is https://github.com/nilsnolde/valhalla-app. If you are interested in participating in a beta test, please email me at my work address [email protected].