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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Données Québec
Gouvernement du Québec — Ministère des Ressources naturelles et des Forêts · Open & public data
Québec's shared open-data portal where provincial ministries and municipalities publish datasets under a Creative Commons Attribution licence
CC-BY-4.0FreeNov 2, 2026
H3
Uber Technologies (open-source project) · GIS & mapping
Hexagonal hierarchical geospatial indexing system from Uber with a C core and bindings for Python, JavaScript, Java and SQL engines
Apache-2.0Open sourceFreeLocalNov 2, 2026
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
Overpass API
Roland Olbricht and the OpenStreetMap community · GIS & mapping
Read-only query service for OpenStreetMap data using the Overpass QL language, available on public instances or self-hosted
AGPL-3.0-onlyFreeOpen sourceSelf-hostedNov 2, 2026
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