There are plenty of third party ROMs available for Android users to pick and choose from. Some are better known than others and some have been around for longer, and while we often look towards Cyanogen
and Paranoid Android
as highlights here, there is another, newer option with OmniROM. The OmniROM team, which is made up of a few well known Android developers have released a Kit Kat based ROM with support for 15 devices.