What gui toolkit does the editor use

Hi all, i’m new to unity. The editor is amazing! I’ve never seen a game engine that is so seamless! I have a question that is a bit off topic, the editor has an awesome look and feel, i’d like to try and implement something similar. Based on this post:

I assume the editor is written in mono / C#. Looking trough the list of some of the standard mono gui toolkits here:
http://www.mono-project.com/Gui_Toolkits
i don’t see any that match the look / fel of Unity’s editor. Does anyone know which toolkit the editor uses?

The unity editor GUI is written aigainst the unitygui API. The same API we expose to all our users