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lvgl
Powerful and easy-to-use embedded GUI library with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash).
Doesn't look that bad. FYI: I ported LvGL (https://lvgl.io/) on STM32F746discovery board (took me only few weeks to understand the F746 & port LvGL). Not working yet is the ability to swipe complete screens (when I try that, the firmware doesn't seem to boot anymore). But one can make drop down lists, pop ups, buttons etc. If there's interest for this just let me know and I'll try to make a description of every step I did so far (my plan is / was to do this when I get screen swipes working but I'm interrupted so it's pending for some weeks now). The advantage of LvGL is that it has relative small memory footprint and relative low CPU load. But when things go bad - like with screen swipe option - debugging of what goes wrong isn't easy (I tested my code first on Windows emulator, where it works completely but on STM32 it only boots if I don't use the ability to swipe entire screens).
