We’ve developed a very advanced mobile-optimized mapping viewer based on OpenLayers 6.4x
It supports Catalog Data Loading (JSON)
Users can load their own GIS Vector Data like GeoJSON, KML, GPX, CSV, WKT
and Mapping Service URL’s like WMS, WFS, WMTS, MapServer, ImageServer, FeatureServer
Raster Tiles and Vector Tiles
This is available in a web browser, Mobile App – MapDiscovery Mobile Mapping Framework and Windows Desktop App