Myra is UI Library for MonoGame and FNA.
It has following functionality:

• UI Widgets. Button, CheckBox, ComboBox, Grid, Image, Menu, ProgressBar, ScrollPane, SplitPane(with arbitrary number of splitters), Slider, TextBlock, TextField, SpinButton, Tree and Window. All of it are demonstrated here:
• UI Skinning. The awesome default skin had been borrowed from the VisUI project. The default skin could be replaced with a custom skin loaded from the JSON.
• UI Editor. Myra's binary distribution contains standalone UI Editor application:

https://github.com/rds1983/Myra/wiki

• MonoGame
• FNA
• MonoGame.Extended
• VisUI
• LibGDX
• Cyotek.Drawing.BitmapFont