I used to list a bunch of free software things I'd written over the years, both for and in Python, and for Emacs/XEmacs. Most of that's pretty seriously out of date now, so let me just point you to my public repositories.
I develop most of my personal stuff on GitLab just because I really like the UI, it has great support for the entire software lifecycle, it has an open source edition, and it has some great features, such as "merge when CI completes".
You might also find my personal Python style guide interesting. It's based on PEP 8 of course, and it forms the basis of the GNU Mailman style guide. You probably disagree with some of my choices, but you'd be wrong .