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
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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
QuantConnect
QuantConnect Corporation · Financial analysis & investing
Algorithmic trading platform built on the open-source LEAN engine, with cloud backtesting, research notebooks and brokerage-connected live trading
Apache-2.0FreemiumPaidLocalNov 2, 2026
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