https://github.com/enthought/ets
https://github.com/enthought/jigna
https://github.com/enthought/pyql
https://github.com/enthought/blockcanvas
https://github.com/enthought/textacy
https://github.com/enthought/ensemble
https://github.com/hmmlearn/hmmlearn
https://github.com/larsmans/seqlearn
https://github.com/quandl/quandl-python
https://github.com/enthought/atom
https://github.com/cuemacro/finmarketpy
https://github.com/cuemacro/findatapy
https://github.com/cuemacro/chartpy
http://vispy.org/
https://github.com/jonathanslenders/pymux/ https://github.com/jonathanslenders/pyvim/ https://github.com/jonathanslenders/ptpython/ https://github.com/xonsh/xonsh https://github.com/ergonomica/ergonomica
https://github.com/ReactiveX/RxPY
https://github.com/kachayev/fn.py
https://github.com/EntilZha/PyFunctional
Not quite reactive, but functional programming https://github.com/evhub/coconut