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1 project | reddit.com/r/embeddedlinux | 15 Nov 2021
what do you think of lvgl library (https://lvgl.io/)?
LVGL – Light and Versatile Embedded Graphics Library
1 project | news.ycombinator.com | 5 Nov 2021
I Dread Writing Embedded GUIs
3 projects | news.ycombinator.com | 5 Nov 2021
I think this is mostly a problem of finding good tools for your workflow. Admittedly, there are fewer of them in the space of embedded development than for the usual "apps", but there are some. Besides the already mentioned LVGL  for the actual GUI you'll need a proper build tool that can handle all that conversion stuff OP's talking about reliably. I can only recommend Bob  here. Unfortunately, it's very unknown but brings everything you need for embedded development (w/ or w/o GUI, higher-level stuff like custom Linux images, too). Using it for years professionally and for personal projects and will never look back.
LVGL - Light and Versatile Embedded Graphics Library (micropython)
1 project | reddit.com/r/Python | 16 Oct 2021
Top 10 trending github repos of the week🌟.
10 projects | dev.to | 15 Oct 2021
Website · Docs · Forum · Services · Interactive examples
Lvgl/lvgl: Powerful and easy-to-use embedded GUI library
5 projects | news.ycombinator.com | 6 Oct 2021
What GUI library for medical devices ?
1 project | reddit.com/r/C_Programming | 30 Aug 2021
Personally, I think LVGL is pretty great: https://lvgl.io/
What c/c++ GUI framework should I learn that has good data display options (graphs etc.)
4 projects | reddit.com/r/embedded | 31 May 2021
I've had good luck with LVGL.4 projects | reddit.com/r/embedded | 31 May 2021
On embedded, zephyr uses https://lvgl.io ... but I've never used it
Looking for a place to start learning about designing multipage UI for an st7789 TFT LCD display?
1 project | reddit.com/r/esp32 | 16 Apr 2021
I think what you're looking for is LVGL.
What are some alternatives?
imgui - Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
GuiLite - ✔️The smallest header-only GUI library(4 KLOC) for all platforms
littlefs - A little fail-safe filesystem designed for microcontrollers
embox - Modular and configurable OS for embedded applications
hagl - Hardware Agnostic Graphics Library for embedded
OctoPrint-TouchUI - A touch friendly interface for a small TFT module or phone
qt5-webkit-container - A barebones WebKit container for pure HTML5 UI
bekantfirmware - Programmable position memory for IKEA BEKANT adjustable sit/stand desk
lvgl-sdl - A crossplatform SDL wrapper for the Light and Versatile Graphics Library https://lvgl.io/.
gfxprim - Open-source modular 2D bitmap graphics library with emphasis on speed and correctness.
flipper - A desktop debugging platform for mobile developers.