OpenSolaris is described as 'was an open source operating system based on Sun Microsystems Solaris. It was also the name of the project initiated by Sun to build a developer and user community around it' and is a Operating System in the OS & Utilities category. There are more than 25 alternatives to OpenSolaris for a variety of platforms, including Linux, Windows, Self-Hosted solutions, BSD and Mac. The best alternative is Ubuntu, which is both free and Open Source. Other great apps like OpenSolaris are Debian (Free, Open Source), Linux Mint (Free, Open Source), Arch Linux (Free, Open Source) and Fedora (Free, Open Source).
Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.
Linux Mint is one of the most popular desktop Linux distributions and used by millions of people. The purpose of Linux Mint is to produce a modern, elegant and comfortable operating system which is both powerful and easy to use. Latest: Uma (20.2).
Arch Linux is an independently developed, i686- and x86_64-optimised GNU/Linux distribution targeted at competent Linux users. It uses pacman, its home-grown package manager, to provide updates to the latest software applications with full dependency tracking.
ReactOS™ is an Open Source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft® Windows™ NT family of operating systems (NT4, 2000, XP, 2003, Vista, Seven).