The Cyanogen OS is, or rather was, another version of Android. Initially developed as a project for those who would just like another flavor of Android to avoid all the company bloatware that comes along when you purchase a new smartphone, it quickly turned into an official business and the Cyanogen OS started shipping even with branded smartphones like OnePlus One and Wilefox Storm. What would happen to these phones running on the Cyanogen OS once all the services and the nightly builds a shutdown? No idea.
According to this blog post from the Cyanogen company blog, from December 31, 2016 onwards, all its services are shutting down. Yes, it’s comparatively a smaller blog post. Support will no longer be available. There will be no nightly builds. Goes without saying that the operating system will not be installed on new devices. Although, people already running CyanogenMod shouldn’t have a problem.
A few years ago I installed a version of CyanogenMod on one of my Samsung Galaxy tablets after rooting it. I won’t say it was a good experience. I continuously faced problems. Installing third-party Android ROMs can anyway be a headache if you aren’t doing it on an ongoing basis. My tablet would continuously crash and there were very few apps I could use. I remember for a couple of months I couldn’t even start Google Play because it won’t stop crashing. Then somehow I figured out but the time I spent on all the effort wasn’t at all worth it.
Here is a nice story on how Cyanogen evolved and turned into a full-blown business.