For embedded systems, LVGL is a powerful fully open-source UI library. It is free for both personal and commercial projects, making it a go-to for developers building HMIs on microcontrollers (MCUs) or MPUs.
Several industry leaders and open-source platforms provide extensive libraries that cater specifically to industrial automation: free hmi graphics library
While primarily a paid product, Symbol Factory provides a free trial that allows users to access and test the first symbol in each of its thousands of industrial categories. General Graphic Repositories For embedded systems, LVGL is a powerful fully