What are some alternatives?
When comparing CopperheadOS and Carbon ROM, you can also consider the following products
LineageOS - Operating system for smartphones and tablet computers, based on the Android
Replicant - Replicant is a distribution of Android that is 100% Free Software.
MIUI - Xiaomi MIUI Official Global Site. MIUI is a customized Android ROM developed by Xiaomi for smartphones and tablets. MIUI Forum offers ROM downloads for 251 devices including Mi 6, Mi MIX 2, Redmi Note 4 and others.
Android - Android is an open source mobile operating system initially released by Google in 2008 and has since become of the most widely used operating systems on any platform.
AOKP - AOKP stands for Android Open Kang Project. It is a custom ROM distribution for many Android devices.
Resurrection Remix OS - Resurrection Remix ROM is ultimately full featured, stable and combined with the best features of...