CyanogenMod is described as 'Aftermarket firmware for a number of cell phones based on the open-source Android operating system. It offers features not found in the official Android based firmwares of vendors of these cell phones' and is a leading Android ROM in the os & utilities category. There are more than 10 alternatives to CyanogenMod for a variety of platforms, including Android, Android Tablet, Linux, KDE Plasma and Self-Hosted apps. The best CyanogenMod alternative is LineageOS, which is both free and Open Source. Other great apps like CyanogenMod are Android, GrapheneOS, Ubuntu Touch and Replicant.