dud

LineageOS (I use this one)

Graphene OS

Functionally they are virtually identical to stock Android. Android began as an open-source project, and these versions are built off of that.

anyapk is a lightweight Android application installer that bypasses Google's developer verification requirements by using local ADB (Android Debug Bridge) connections. Smoothly install any APK file on your device without restrictions, gatekeepers, or corporate approval.

a tweet by @/Pirat_Nation:

From September 2026, all apps, including those outside the Play Store, must come from verified developers.

No more anonymous sideloads. No quick comebacks for malware gangs.

First: Brazil, Indonesia, Singapore, Thailand.

"Sideloading" is the rentseeker word for "being able to run software of your choosing on a computing device you purchased". There is no reasonable case for an operating system developer having a say over what programs you run on your hardware.