Chocolatey NuGet is a Machine Package Manager, somewhat like apt-get, but built with Windows in mind.
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Zipline is a Pythonic algorithmic trading library. The system is fundamentally event-driven and a close approximation of how live-trading systems operate. Currently, backtesting is well supported, but the intent is to develop the library for both paper and live trading, so that the same logic used for backtesting can be applied to the market.
Zipline is currently used in production as the backtesting engine powering Quantopian (https://www.quantopian.com) — a free, community-centered platform that allows development and real-time backtesting of trading algorithms in the web browser.