Two-body orbital propagation tools
pip install keplertools
To also compile the Cython versions (compiler required, see here for details: https://cython.readthedocs.io/en/latest/src/quickstart/install.html):
pip install --no-binary keplertools keplertools[C]
If using a zsh shell (or depending on your specific shell setup), you may need to escape the square brackets (i.e., the last bit of the previous command would be keplertools\[C\].