GeoPandas
GeoPandas developers (NumFOCUS affiliated) · GIS & mapping
Python library extending pandas with geometry columns, spatial operations, reprojection, spatial joins and file I/O for vector geodata
BSD-3-ClauseOpen sourceFreeLocalNov 2, 2026
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Interactive Brokers API
Interactive Brokers LLC · Financial analysis & investing
Programmatic trading and market-data access to Interactive Brokers accounts through the TWS API, the REST-based Web API and FIX
ProprietaryUsage-basedPaidLocalRedirected
PostGIS
PostGIS Project Steering Committee (OSGeo) · GIS & mapping
Spatial extension for PostgreSQL adding geometry, geography and raster types with indexing and hundreds of SQL functions
GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026
QGIS
QGIS.org association · GIS & mapping
Open-source desktop GIS for viewing, editing, analysing and publishing vector and raster geodata, extensible with Python plugins
GPL-2.0-or-laterOpen sourceFreeLocalBroken
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
QuantLib
QuantLib project (Luigi Ballabio and contributors) · Financial analysis & investing
Open-source C++ library for quantitative finance covering instruments, term structures, pricing engines and calendars, with Python and other bindings
BSD-3-ClauseOpen sourceFreeLocalNov 2, 2026
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