I can't seem to find this anywhere - there's examples with open street maps, and hints to using mapbox but otherwise I'm wondering what other maps and url's are available?
2 Answers
This one gives a lot of examples (taken from above comments gis.stackexchange link) : https://leaflet-extras.github.io/leaflet-providers/preview/
The must is that you can preview everything.

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There is definitely no such exhaustive list of Tile Providers, but there are plenty other resources listing quite a bit of options.
Strangely, it indeed looks like they cannot be found under such an explicitly stated question yet.
Here are a few:
- R leaflet Language of the map : Can we specify to use English language
- How to use a different tile provider in openlayer3
- on GIS Stack Exchange: https://gis.stackexchange.com/questions/184125/alternative-basemaps-for-leaflet/268290
- and of course the official Leaflet plugins page, which has a section for basemap providers: https://leafletjs.com/plugins.html#basemap-providers
The main reference with very nice live preview is the leaflet-providers demo page (although you do not need to use that plugin at all in the end): https://leaflet-extras.github.io/leaflet-providers/preview/
An extension to Leaflet that contains configurations for various free1 tile providers.
And with the note (emphasis mine):
What do we mean by free?
1 We try to maintain leaflet-providers in such a way that you'll be able to use the layers we include without paying money. This doesn't mean no limits apply, you should always check before using these layers for anything serious.

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