Mapbox. An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
World maps you can self-host - powered by free OpenStreetMap vector tiles and open-source software. – OpenMapTiles. Design and host maps with OpenStreetMap vector tiles and open-source tools. Maps are compatible with Leaflet, Mapbox GL SDKs, GIS, WMTS/WMS, XYZ map tiles, etc.
Top-shelf Code training - CodeSource.io. CodeSource - Advanced Tutorials and articles for web and app development, we cover topics including, Vue, JavaScript, Laravel, Flutter and more