For those who want the classic Amiga, there is UAE, the Universal Amiga Emulator, which needs kickstart ROMs and boot disk images to work. You can buy them from Amiga Forever; the emulator comes with all the files you need plus other goodies.
For the classic Amiga 68K series, it is recreated via the Minimig, which uses SD cards instead of floppy disks; a must for retro computer hobbyists. AmigaOS 4.1 exists for PowerPC based SAM 440EP systems like the SAM 440Ep systems and parts sold here. (I am not associated with Amiga Kit or Amiga Inc. or any Amiga company. I am just an Amiga user since 1985 and very much into retro computing.)"