IBInteractive Brokers LLC · Financial analysis & investing
In-depth entry Programmatic trading and market-data access to Interactive Brokers accounts through the TWS API, the REST-based Web API and FIX
ProprietaryUsage-basedPaidLocalRedirected QQuantConnect Corporation · Financial analysis & investing
In-depth entry 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 VOleg Polakow · Financial analysis & investing
Python library for vectorized backtesting and portfolio analysis built on pandas, NumPy and Numba, with a commercial PRO edition
Apache-2.0 WITH Commons-ClauseFreePaidLocalNov 2, 2026