Linux

Linux is an fast, stable, and open source operating system for PCs and workstations that
features professional-level Internet services, extensive development tools, fully functional
graphical user interfaces (GUIs), and a massive number of applications ranging from office
suites to multimedia applications. Linux was developed in the early 1990s by Linus
Torvalds, along with other programmers around the world. As an operating system, Linux performs many of the same functions as Unix, Macintosh, Windows, and Windows NT. However, Linux is distinguished by its power and flexibility, along with being freely available. But linux has not been able to reach out like that of windows due to its user friendly options which is far behind the windows.

Wubi : Windows based linux installer

Wubi is an Ubuntu installer that lets you install and run Ubuntu from Windows. It is
a simple, safe, and painless way to install Linux for users who want to preserve their
Windows system without having to perform any potentially hazardous hard disk partition
operations to free up space and create new hardware partitions for Ubuntu.