This API speeds up and improves the process of creating GUIs for Minecraft plugins.
It is designed with customizeability and expandability in mind, if you don't like the preexisting Windows, you can easily expand upon them or make your own.
Depends on ProtocolLib if the TextWindow is used
The wiki can be found here
https://skiftstar.github.io/GuiAPI-Redone/
Please Check the Wiki for this