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, BSD and Mac apps. The best OpenSolaris alternative is Linux Mint, which is both free and Open Source. Other great apps like OpenSolaris are Ubuntu, Debian, Fedora and Arch Linux.