D3
Observable, Inc. · Data visualization
Modular JavaScript library for bespoke, data-driven web graphics: scales, axes, shapes, layouts, geo projections, transitions and DOM selections
ISCOpen sourceFreeLocalNov 2, 2026
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Leaflet
Volodymyr Agafonkin and contributors · GIS & mapping
Lightweight open-source JavaScript library for interactive tile-based web maps with markers, vector layers and a large plugin ecosystem
BSD-2-ClauseOpen sourceFreeLocalNov 2, 2026
MapLibre
MapLibre Organization · GIS & mapping
Open-source vector-tile map renderers for web (GL JS) and native platforms, forked from Mapbox GL and governed by a community organisation
BSD-3-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026
OpenStreetMap
OpenStreetMap Foundation · GIS & mapping
Collaboratively edited world map database released under the ODbL, with planet files, an editing API and derived tiles and extracts
ODbL-1.0FreeSelf-hostedNov 2, 2026
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