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 RDGordian · Construction estimating & quantity surveying
In-depth entry Gordian's construction cost database of unit prices, assemblies and square-foot models with location factors, sold online and in annual books
ProprietaryPaidEnterpriseNov 2, 2026