Most of my open source work focuses on bqplot, an open source interactive visualization library for the Jupyter notebook. bqplot comes from the ipywidgets infrastructure, which I also work a great deal with.
Here's a video of us speaking about it at SciPy:
I gave a more extended talk on bqplot at both PyData Seattle and PyData Ann Arbor:
from bqplot import pyplot as plt
import numpy as np
x = np.linspace(0., 10., 100)
plt.plot(x, np.sin(x), colors=['Red'])