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).
CloudReady is a operating system built and maintained by Neverware. Based on Google’s open source Chromium OS, CloudReady uses web apps and both cloud storage (Google Drive) as well as local storage (File manager). Comes without Android app support.
antiX is a fast, lightweight and easy-to-install linux live CD distribution based on MEPIS and Debian's testing branch for Intel/AMD x86-compatible systems. antiX offers users the "Magic of MEPIS" in an environment suitable for old computers.
Bodhi Linux, a lightweight distribution featuring the fast & fully customizable Moksha Desktop (https://alternativeto.net/software/moksha/about/). The 64-bit is built on top of Ubuntu (20.04). The 32-bit Non-PAE architecture has a Ubuntu 18.04 base – Bodhi Linux 6.0.