What is CyanogenMod?
CyanogenMod is an 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.
Features supported by CyanogenMod include native theming support, FLAC audio codec support, a large Access Point Name list, an OpenVPN client, an enhanced reboot menu, support for Wi-Fi, Bluetooth, and USB tethering, CPU overclocking and other performance enhancements, soft buttons and other "tablet tweaks", toggles in the notification pull-down (such as wi-fi, Bluetooth and GPS), app permissions management, as well as other interface enhancements.
Cyanogen Inc discontinued the support for CyanogenMod on December 31, 2016. Even if its source code will remain available, the staff forked the project and created LineageOS : https://web.archive.org/web/20161225144318/https://www.cyanogenmod.org/blog/a-fork-in-the-road
Comments and Reviews
Said about CyanogenMod as an alternative
Good alternative, thanks CyanogenMod developer
CyanogenMod is a hugely more private and secure OS choice for phones. It's community driven, has many features Android lacks (because Google doesn't put in). In fact, it has developed features later adopted by Google's Android. CyanogenMod also updates without waiting for your carrier to offer you the update. The downside is that CyanogenMod might not work on the very newest handsets, so check out the list of handsets it works well with first.