AmigaOS 3.1 is described as 'This version was originally shipped with the Amiga 1200 and Amiga 4000 computers. Version added datatypes support and Workbench could load any background image in any format if the required datatype was installed. This feature was also used in Multiview' and is a operating system in the os & utilities category. There are four alternatives to AmigaOS 3.1 for AmigaOS, MorphOS and AROS. The best AmigaOS 3.1 alternative is AROS, which is both free and Open Source. Other great apps like AmigaOS 3.1 are AmigaOS, MorphOS and AmigaOS 3.9.