LineageOS is the most-used custom Android ROM around, but that doesn't mean there isn't room for others. Paranoid Android was a popular choice back in the KitKat days, and while the ROM returned in full force with Nougat builds in 2017, there hasn't been much news since. Now the project is back (again), touting Android 10 builds for nine phones so far.
LineageOS is the most popular custom ROM in existence, and the project prides itself on bringing newer versions of Android to unsupported devices. However, Lineage has been a bit slow to roll out a version based on Android 10 — the Pie-based ROM was already available by this time last year. Thankfully, the next major version of LineageOS seems to be just around the corner.
LineageOS is one of the most popular custom Android ROMs available, with over two million active installations. The project officially ended support for the 14.1 (Android 7.1) branch a few days ago, in preparation for LineageOS 16. The 16.0 branch is finally rolling out, and it's bringing Android 9 Pie to dozens of phones and tablets.