EditTK is a Framework for 3D Level Editors or any kind of 3D Editor really, it's a spiritual successor to the GL_EditorFramework and will be used for all future Editors (once it's done). It makes heavy use of the Silk.NET library. The Frameworks graphics are powered by WebGPU and as such it supports Direct3D12, Vulkan and Metal (not tested yet). And for UI it uses ImGUI (ImGui.Net).
It's currently being fully rewritten