This is not an exhausitve list, but will try to capture any tools, libraries or databases that are mentioned during meetings.
Jupyter Notebook (formerly IPython notebook) – Open source shareable notebooks with interactive data and scientific computing.
PyCharm – Cross-platform Python IDE (Community and Pro editions).
Anaconda Python – A great “batteries-included” distribution of Python, and includes conda, a command-line Python package manager.
RDKit – Open source Python/C++ cheminformatics library
Scikit-learn – Open source python tools for machine learning and data analysis
Cambridge Structural Database – 800,000+ molecular crystal structures. Online access at webcsd.ccdc.cam.ac.uk. University of Oxford has site-licence for tools including Python API, Mogul, Gold, Hermes. Distributed to contributing departments – contact email@example.com for download details.