There are 3 repositories under monogame-gui topic.
Libraries for MonoGame and FNA that provide abstractions, quality of life improvements and additional features like a ui system and easy input handling.
A flexible UI framework for MonoGame
UI framework for MonoGame game engine.
MonoGame plugin for JetBrains Rider
Lite GUI environment for MonoGame
Игровой движок
Edit MonoGame Content Builder files in VSCode