Windows 7 is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Ubuntu, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Windows 7 and loads of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Windows 7 are Linux Mint (Free, Open Source), Debian (Free, Open Source), Arch Linux (Free, Open Source) and Manjaro Linux (Free, Open Source).
The OpenMandriva distribution is a full-featured Linux desktop and server, sponsored by the OpenMandriva Association, and is based on ROSA, a Russian Linux distribution project which forked Mandriva Linux in 2012.
Ubuntu Cloud is an open source Linux operating system designed to be used as a personal cloud server. It is based on the well known Ubuntu Linux distribution and recognized as an official Ubuntu flavor, distributed by Canonical.
MidnightBSD is a new BSD-derived operating system developed with desktop users in mind. It includes all the software you'd expect for your daily tasks — email, web browsing, word processing, gaming, and much more.
Superb Mini Server (SMS) is a Slackware-based server distribution with web, DNS, DHCP, file, print and fax servers, iptables firewall, mail server with spam filter and anti-virus scanner, and BitTorrent station.
Bluestar Linux is an Arch Linux-based distribution, built with an understanding that people want and need a solid Operating System that provides a breadth of functionality and ease of use without sacrificing aesthetics.