A notable mention is https://ubports.com/en/ which is different from postmarketos in a sense that ubports uses old kernels with heavy patches. That means: good support for things, but difficult future.
PostmarketOS uses the newest kernels and tries to integrate their patches into mainline kernel, so that the reliability is maintained with all kernel developers.
The FuriPhone, which runs the FuriOS Linux distribution (based on Debian), has a polished enough user experience that it can be used as a daily driver by many people.