MapTiles is a CDN layer of map tiles for using with OpenLayers or Leaflet map.

Why?

Some tile providers allow the usage of the tiles they render directly. But these providers, usually recommend limitations on your usage in order for avoiding excessive bandwidth and resources.
MapTiles takes advantage of their tiles favouring their usage recommendations.  

Maptiles is a free tool made for myself mainly.

How?

Tiles served by MapTIles are consumable with javascript map libraries like OpenLayers or Leaflet.

What tilesets are available?

The layers shown here are some of the layers mentioned in OpenStreetMap’s Tiles wiki article.

OpenStreetMap Mapnik Style

This is the default style shown on http://openstreetmap.org. These tiles are cached directly from the OpenStreetMap Foundation’s .tile.osm.org servers.

http://{s}.osm.maptiles.xyz/{z}/{x}/{y}.png

Sample JSBIN using OSM Mapnik tiles

OpenStreetMap Mapnik Grayscale Style

This style is a grayscale version of OpenStreetMap’s Mapnik style. These tiles are cached from the Wikimedia Foundation’s tiles.wmflabs.org servers.

http://{s}.grayscale.osm.maptiles.xyz/{z}/{x}/{y}.png

Sample JSBIN using OSM Mapnik grayscale tiles