Leaflet
Maps & GISLightweight JavaScript library for interactive maps
Replaces Google Maps JavaScript API
Best Plugins Maps & GIS for self-hosting
The 4 best Plugins maps & gis you can self-host, ranked by community traction.
QGIS
Maps & GISFree and open-source geographic information system
Replaces ArcGIS
OpenLayers
Maps & GISHigh-performance library for all kinds of web maps
Replaces Google Maps JavaScript API
MapStore
Maps & GISOpen-source framework for creating web map portals
Replaces ArcGIS Online, Carto
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Every option here is open-source and self-hostable, tagged Plugins within the maps & gis category. Compare them on the individual app pages for setup difficulty and resource requirements.