Did you consider OpenLayers? It's been around for a long time and is really powerful when compared to other open source web-based mapping/GIS options - unfortu

Did you consider OpenLayers? It's been around for a long time and is really powerful when compared to other open source web-based mapping/GIS options - unfortunately I never really need the advanced features in the projects I tend to work on. https://openlayers.org/ https://openlayers.org/ Edit, my favourite from their list of examples: https://openlayers.org/en/latest/examples/sea-level.html https://openlayers.org/en/latest/examples/sea-level.html