Here are some projects that I am or was involved in :

Flathub
I maintain the Discord Flatpak but I've recently started working on updating applications from EOL runtimes all over the place.

fp-build
This is a tool I made to help myself find problems before I try to make a pull request and see it fail, I've made fp-build to have things like checking for 128x128 icons, check that appstream is valid amongst other things.

fp-stats
These are some python scripts to generate data about Flathub applications such as what architectures they support, what runtime they rely on. I want to expand it to check for other types of data that we might want to improve upon.

Jintaku-Cogs-V3
These are not actively maintained cogs for Red Discord Bot. I should really go fix some of them or retire them at some point in time.