The most popular custom Android ROM, the Cyanogen OS, announced that it is closing its services starting from December 31, 2016. The open source project and source code will remain available for anyone who wants to build their own CyanogenMod. Mobile devices running the OS (i.e. Cyanogen One), will have to switch to the open-source version of the cyanogenMod OS. A new project, Lineage, will continue to live on it, but it is still in its infancy.”]
Source: https://securityaffairs.co/wordpress/54753/mobile-2/cyanogen-shut-down.html