There are alternatives depending on what you want to do, what you use it on, and what you are prepared to accept.
Some of those Include linux , android, Chrome, macOS, etc, but one of the problems is that of usability. If someone, or site or doesn't think it's worthwhile supporting your OS, it can be a problem. Buy a new bit of hardware only to find out the manufacturer doesn't provide drivers for your OS and it can be frustrating.
