Free tile provider for Leaflet

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I'm using Leaflet for the maps of my website. So far I was using maps of Mapbox (they're cool), but they obviously charge for them for website with 100,000+ maps per month.

I'm trying to find a provider of tiles which no charge for their tiles. Initially, I do it with OpenCycleMap, and substituted

https://{s}.tiles.mapbox.com/v3/{id}/{z}/{x}/{y}.png

with

http://{s}.tile.opencyclemap.org/cycle/{z}/{x}/{y}.png

Two questions:

1) Does OpenCycleMap provide free tiles with no restriction of maps per month?

2) Does anybody know any other free provider?

Thank you very much.



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