Operating Systems
Includes free operating systems of different platforms to be able to run different programs on your machine. (I mean you wouldn't see this site if it wasn't for those, right?)
Arch Linux
A simple and elegant rolling release Linux distro for giving you the only components to make it work and letting you in full control of the customization. If you to know the nuts and bolts of the Linux kernel, then go ahead and try this (hopefully you have all of the needed hardware compatible and has a fast enough internet connection).
FreeBSD
A free and open source operating system based on BSD.
Linux Mint
An Ubuntu-based distro with a fixed release model that provides a classic desktop experience with multimedia support out-of-the-box and user-created configuration.
Personal comment:
Recommended for beginners.
Manjaro
An Arch-based desktop and intuitive Linux distro with a rolling release model. Another one of the beginner-friendly distro that gives you an ease of maintenance and a wide range of available software with Arch Linux software repositories.
OpenSUSE
A stable release Linux distro for accessibility. Available in two distinct versions: Tumbleweed and Leap.
Ubuntu
A stable release Linux distro made by Canonical being updated every 6 months starting from April. Has two releases, one being the long-term support (LTS) version and the other is the more advanced version.
Personal comment:
I recommend this one for beginners. Though I have some problems with it due to hardware issues.
Windows 10
Includes various reasons to stay or dual-boot with a Linux distro.
Personal comment:
I guess it is free now, also recommended if you want to explore Windows app marketplace.
Personal comment:
Not recommended for beginners.