Based on our record, IUP Portable User Interface seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
As C libraries, I can recommend IUP. You can also choose immediate mode which has the same look on all platforms, there are some wrappers around imgui in Zig like zig-upaya. Source: almost 3 years ago
Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.
PySimpleGUI - A simple to use GUI that can create custom GUIs
FLTK - Fast Light Toolkit - Fast Light Toolkit (FLTK)
PyQt - Riverbank | Software | PyQt | What is PyQt?
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Dear PyGui - Dear PyGui is a simple to use (but powerful) Python GUI framework. Dear PyGui provides a wrapping of Dear ImGui which simulates a traditional retained mode GUI (as opposed to Dear ImGui's immediate mode paradigm).