Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

github.com/ocornut/imgui

Python

Dear PyGui: A fast and powerful Graphical User Interface Toolkit for Python with minimal dependencies

github.com/hoffstadt/DearPyGui

WebAssembly (wasm)

github.com/jnmaloney/WebGui
github.com/schteppe/imgui-wasm
Native ImGui in the Browser

Applications

github.com/wolfpld/tracy, Tracy Profiler: C++ frame profiler