Within game development it's Dear ImGui. https://github.com/ocornut/imgui https://github.com/ocornut/imgui Normally with the Windows DX12 backend, sometimes wi

Within game development it's Dear ImGui. https://github.com/ocornut/imgui https://github.com/ocornut/imgui Normally with the Windows DX12 backend, sometimes with the SDL+OpenGL backend if you want cross platform support. Other frameworks are sort of disappearing. C++ all the way although some use it with C#.