Investment
web-based technical screener for candlestick patterns using Python and Flask
Python wrapper for TA-Lib (http://ta-lib.org/).
Download market data from Yahoo! Finance's API
Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
Code for Machine Learning for Algorithmic Trading, 2nd edition.
Financial Markets Data Visualization using Matplotlib
Python Backtesting library for trading strategies
Zipline, a Pythonic Algorithmic Trading Library
A list of online resources for quantitative modeling, trading, portfolio management
Plotting addon for backtrader to support Bokeh (and maybe more)
A curated list of insanely awesome libraries, packages and resources for Quants (Quantitative Finance)