I have worked on several projects and some of them are below.
Skarf is a selfhostable linktree alternative which can compile down to plain HTML, CSS, JS etc. It has a customisable YAML configuration, or JSON if you prefer, it was coded with Flask in Python
Demo: Skarf Demo
Clock App is a simple clock application which runs in your browser and can be installed as a PWA, it has customisable appearance with custom themes that can be shared.
If you want themes for this clock app you can join the Discord.
Github: Clock App
Public Instance: Clock App
Docs: Woof-Terminal Docs