I've recently had a lot of fun/success with Dear ImGui (C++) -- not a game engine, but originally/partly meant for use in them. https://github.com/ocornut/imgui

I've recently had a lot of fun/success with Dear ImGui (C++) -- not a game engine, but originally/partly meant for use in them. https://github.com/ocornut/imgui https://github.com/ocornut/imgui