SABA  Sherpa Bridge to Astropy

Sherpa can be used as part of astropy.modeling thanks to SABA - Sherpa Bridge to Astropy

https://saba.readthedocs.io/en/latest/

The development of this package was made possible by the generous support of the Google Summer of Code program in 2016 under the OpenAstronomy by Michele Costa with the support and advice of mentors Tom Aldcroft, Omar Laurino, Moritz Guenther, and Doug Burke.

Sherpa 4.9 Release 

Sherpa 4.9 was just released this week. It now runs in Python 2.7 and Python 3.5. There has been minimal testing with Python 3.6. Support for versions 3.3 and 3.4 would require community support.

Check our GitHub page:
https://github.com/sherpa/sherpa/

Jupyter Notebooks are available on the wiki:

https://github.com/sherpa/sherpa/wiki