RetroBSD is described as 'Port of 2.11BSD Unix intended for embedded systems with fixed memory mapping. The current target is Microchip PIC32 microcontroller with 128 kbytes of RAM and 512 kbytes of Flash' and is a operating system in the os & utilities category. There are more than 100 alternatives to RetroBSD for a variety of platforms, including Linux, Self-Hosted, BSD, Windows and Mac apps. The best RetroBSD alternative is Linux Mint, which is both free and Open Source. Other great apps like RetroBSD are Debian, Fedora, Arch Linux and Manjaro Linux.