Is there an open-source OS for feature phones?

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The original was posted on /r/opensource by /u/Qwert-4 on 2024-08-12 08:22:40+00:00.

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I’m struggling to find a fully open-source OS for simple feature phones. AOSP requires at least 512 MB of RAM and Gerda, a drop-in replacement for KaiOS, the closest FOSS project I could find, needs 256 MB.

Meanwhile the market of simple feature phones (below 64, usually 16-32 MB RAM) is dominated by 3 operating systems: Nokia’s S30+, Nucleus RTOS and ThreadX. I know ThreadX core is open-source (MIT), as well as some libraries, but DEs and applications aren’t.

Is there a project of a fully open-source low-spec feature phone operating system?

P.S.: BTW, do you know of a good PC emulator of any feature phone OS?