High Quality Content by WIKIPEDIA articles! AROS Research Operating System (AROS - pronounced "AR-OS") is a free and open source multi media centric implementation of the AmigaOS 3.1 APIs. Designed to be portable and flexible, ports are currently available for x86-based and PowerPC-based PCs in native and hosted flavors, with other architectures in development. Also ported to m68k-based Amiga 1200.