The document discusses several major operating systems: 1. Windows is one of the most popular systems in the market, covering about 90% of the market share. 2. Linux is a widely used open-source operating system based on the Unix system that was developed in 1969. 3. Google Chrome OS is based on the Linux kernel but uses Google's own window manager instead of commonly used ones like GNOME or KDE. Google plans for open-source community collaboration on the project.