OpenLayers is described as «high-performance, feature-packed library for all your mapping needs» and is a Map service in the development category. There are more than 10 alternatives to OpenLayers for a variety of platforms, including Online / Web-based, Linux, iPhone, Windows and Mac. The best alternative is Leaflet, which is both free and Open Source. Other great apps like OpenLayers are Mapbox Studio, OpenMapTiles, MapTiler Cloud and ArcGIS.OpenLayers alternatives are mainly Map Services but may also be GIS Software. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of OpenLayers.