One of the projects that we often followed on our Twitter throughout the last months was Jingling's upcoming tablet and desktop environment. The Chinese start-up initially appeared in January 2021, promising an openly iPadOS-like operating system and releasing a bootable ISO which we test-drove just after its release alongside sources.
Geotechland did a video on the Operating system- JingOS https://tilvids.com/videos/watch/ed21d9ec-51f4-4ad9-9072-5ec092c6f831
Looks very similar to ios