MyBrocard - Brocard allows you to create an unlimited number of virtual cards for paying for advertising and other online payments, manage a team of buyers, choose from 20+ bins for various tasks, and enjoy convenient API for integrations.

QuantConnect - QuantConnect provides a free algorithm backtesting tool and financial data so engineers can design algorithmic trading strategies. We are democratizing algorithm trading technology to empower investors.

Moon Virtual Cards - Purchase Moon Visa® Prepaid Cards with crypto. Pay at millions of online merchants with secure virtual cards.

quantra - A public API for quantitative finance made with Quantlib

ABcard - ABcard - service allows you to issue an unlimited number of cards to pay for advertising accounts. 3 unique BINs for any work tasks, management of a team of media buyers inside a personal account and complete anonymity when paying for traffic.

Backtrader - Backtrader is a complete and advanced python framework that is used for backtesting and trading.