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ImGuiGML is a DLL / GML wrapper of the popular Dear ImGui, library for GameMaker Studio 2
It's currently available only on the Windows platform with macOS and Linux coming soon.
ImGui is a UI library designed for fast implementation and iteration, using an 'Immediate Mode GUI' paradigm You will primarily be putting your GUI functions in step events that are called each step, rather than an event / retained based paradigm of only making updates.
It's available for Free in hopes you all can use it to help speed up your dev and make some neat debugging / editor tools!