As software development is also my hobby, here are some work and private projects I actively worked on or maintained in the past.
Active projects:
These projects are in active development.

Aleeva
The best Guild Wars 2 Bot for Discord 🤖
Aluna
Spring-Boot-Starter for Discord Bots based on JDAOlder projects:
These projects are no longer maintained but are still a good knowledge base.

FoxHttp
FoxHttp provides a fast and easy http client for Java and Android.service-result
Service result is a structural pattern for RESTful Web Services.
GroundWork
Collection of useful libraries for Java and Android.