Keep in mind that these custom ROMs might not be as stable or feature-rich as commercial operating systems, but they can still extend the life of your Nokia N9 and provide a fresh experience.
Which of those should I prepare next?
The N9 is old (2011). "Custom ROM" means nothing if the hardware fails.
There is a holy grail: running alongside MeeGo and Sailfish. The "Exclusive" custom ROM here isn't an OS, but a bootloader hack called u-boot-mod .
Another fascinating niche in the N9 custom ROM scene is the Maemo Leste project. This is an open-source attempt to bring the classic Maemo 5 experience from the Nokia N900 over to the N9. It is built on Devuan Linux and aims to provide a completely free and open mobile operating system. This ROM is exclusive to the hardcore "FOSS" (Free and Open Source Software) community, focusing on terminal access, Debian packages, and total user control rather than consumer-friendly app stores.
