I have no personal experience with it, but you might be interested in this completely open source mouse:

https://ploopy.co/mouse/

https://github.com/ploopyco/mouse

It looks like you can buy a fully assembled mouse, a build it yourself kit, or do it from scratch with the schematics. Doesn’t come with quite as many side buttons though

Thank you for the suggestion! I’ve been trying it out for a few days now and it is my new favorite app in terms of design. I’m having a strange problem where it keeps logging me out every couple days, but other than that I love it

I use Tiny Tiny RSS (https://tt-rss.org/) on desktop, and while they have an official mobile app, I’ve been enjoying Read You on Android