An open-source map server made for vector tiles, and able to render into raster tiles with MapBox GL Native engine on the server side.
It provides maps to web and mobile applications. Supported are Mapbox GL JS, Android SDK, iOS SDK, Leaflet, OpenLayers, HighDPI/Retina, GIS via WMTS, etc.
For details see the project repository on GitHub:
Live demo at: https://maps.klokantech.com/