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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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cimgui
c-api for imgui (https://github.com/ocornut/imgui) Look at: https://github.com/cimgui for other widgets
If you have no aversions to using hardware acceleration and don't mind if the UI isn't native, you could use Dear ImGui. It makes creating a GUI easy and allows you to develop your application rapidly. It also has back-ends for all of the platforms that you mentioned.
Dear ImGui is a C++ library, however a C port exists.
Maybe something like SDL_gui was implied?
NOTE:
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Hence, a higher number means a more popular project.