MINIX 3 is described as 'MINIX is a POSIX-compliant Unix-like operating system based on a tiny microkernel running in kernel mode with the rest of the operating system running as a number of isolated, protected, processes in user mode' and is a operating system in the education & reference category. There are more than 100 alternatives to MINIX 3 for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best MINIX 3 alternative is Linux Mint, which is both free and Open Source. Other great apps like MINIX 3 are Ubuntu, Debian, Fedora and Arch Linux.