Fuchsia is Google's latest operating system
It could be argued that with Android and Chrome OS, Google already has more than its fair share of operating systems; but there's another one in the pipeline.
Very little is known about it at the moment, but Google has a new operating system project underway called Fuchsia. There's a GitHub page up and running, where you can find out about the Fuchsia kernel -- a kernel that is designed with scalability and multi-device, cross-platform compatibility in mind.