The AROS Research Operating System is a lightweight, efficient and flexible desktop operating system, designed to help you make the most of your computer. It's an independent, portable and free project, aiming at being compatible with AmigaOS 3.1 at the API level (like Wine, unlike UAE), while improving on it in many areas. The source code is available under an open source license, which allows anyone to freely improve upon it.
Piyush Khengar, lecturer at Kings College, is now aiming his undergraduate CS students at AROS.
AROS (Amiga Research Operating System) is an initiative since 1997 to reverse engineer AmigaOS 3.1 and 'recreate' it on x86 based hardware platforms. AROS is free and open source, and is aimed at being source code compatible with AmigaOS 3.x. This means that any C source file that was written for the original Amiga platform should compile and run with no modifications on AROS.