It is highly stable but requires a bit of technical knowledge to flash via flasher and rootsh . 2. NITDroid (Android on N9)
After reviewing community forums (maemo.org, XDA Developers, Talk.maemo.org), one actively maintained custom ROM for the Nokia N9 is: nokia n9 custom rom link
Maemo Leste is currently the most active project. It aims to recreate the classic Maemo experience (from the Nokia N900) using modern Debian/Devuan Linux and mainline Linux kernels. It is a full Linux distribution for hackers who want deep control over their device. It is highly stable but requires a bit
The original "Project Mayhem" 4.0.3 ICS ROM and other older Android ports are considered obsolete. nokia n9 custom rom link