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
Next.js
Vercel · Web frameworks & UI
React framework from Vercel for full-stack web applications with file-based routing, server components, server-side rendering, static generation and API route handlers
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
React
Meta Open Source / React team · Web frameworks & UI
Component-based JavaScript library for building user interfaces, created at Meta, with hooks, a declarative rendering model and server components
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
TypeScript
Microsoft · Programming languages & runtimes
Statically typed superset of JavaScript from Microsoft that compiles to plain JavaScript and powers editor tooling across the web ecosystem
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
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