Who is part of OpenAstronomy?

Astropy is a community-driven package intended to contain much of the core functionality and some common tools needed for performing astronomy and astrophysics with Python.
users, dev
SunPy is a community-developed free and open-source software package for solar physics. SunPy is meant to be a free alternative to the SolarSoft and its aim is to provide the software tools necessary so that anyone can analyze solar data.
users, dev
ChiantiPy is a Python interface to the CHIANTI atomic database for astrophysical spectroscopy. CHIANTI consists of a database of atomic data that can be used to interpret spectral lines and continua emitted from high-temperature, optically-thin astrophysical sources.
yt is a python package for analyzing and visualizing volumetric, multi-resolution data from astrophysical simulations, radio telescopes, and a burgeoning interdisciplinary community.

yt-users, yt-dev
JuliaAstro Logo
JuliaAstro is an organization that shepherds the development of community astronomy and astrophysics packages for Julia. These include packages for widely used functionality such as FITS file I/O, world coordinate systems and cosmological distance calculations.
Mailing List
CasaCore Logo
Casacore is a suite of c++ libraries for radio astronomy data processing. Casacore underlies CASA, the Common Astronomy Software Applications developed by an international consortium of scientists at various institutes. Python bindings exist in Python-casacore. Casacore also underlies other radio astronomy software such as WSClean, and LOFAR tools. Casacore is developed by the radio astro organizations around the world. It is open source and will happily merge any (good) pull requests.
The Italian Mars Society (IMS) is a non-profit organization, existing from 2004, as Italian branch of the International Mars Society, created in the USA by Robert Zubrin. IMS is a member of the Mars Society European network. The foundation scope of the Italian Mars Society is to promote research projects devoted to Mars Exploration and the involvement of SMEs and large enterprises in the new economy related to space exploration. IMS is currently spearheading the European MaRs Analog Station for Advanced Technologies Integration (ERAS) project. The project aims to address the major issues that could jeopardize a crewed mission to Mars and are not adequately being addressed at existing terrestrial Mars analogs.
IMS Admin: Antonio Del Mastro ERAS project
Mailing list,
COIN (COsmostatistics INitiative) is an international working group built under the auspices of the International Astrostatistics Association (IAA). It aims to create an interdisciplinary environment where collaborations between astronomers, statisticians and machine learning experts can flourish. COIN is designed to promote the development of a new family of tools for data exploration in astrophysics and cosmology.
COIN Admin: Rafael S. de Souza
Glue is a data visualization application and library to explore relationships within and among related datasets. Its main features include linked statistical graphs, flexible linking across data, and full Python scripting capability.
poliastro is a python package for Astrodynamics and Orbital Mechanics problems, such as orbital elements conversion, orbital propagation, plotting, planetary ephemerides computation, and more.