OK, I can give you a lot of help in this area! I'm going to assume that you are using BeOS, since you posted in the BeOS forum...
Mac:
No one has written a PowerPC emulator. You can't run 8.5 or X. However, you can emulate 68k(680x0) Macs.
Basilisk II is a Mac emulator that runs on just about anything. The homepage is
http://www.uni-mainz.de/~bauec002/B2Main.html
if you just want to download it, the URL for the BeOS x86 version is
http://iphcip1.physik.uni-mainz.de/~cbauer/BasiliskII-0.9-1.beosx86.zip
Basilisk II is really easy to get running. At least, it is on Windows. I don't know if the Basilisk II setup program is included with the BeOS version (should be included). On Windows, all you do is download a ROM (I have one - email me for it) and create a hard drive image. It is the best Mac emulator that exists (literally), and it still can't run anything above Mac OS 8.1. I have 8.1 running on Basilisk II, though, and it runs fine. So what you need is
a: Mac OS 8.0/8.1 CD
- or -
b: A premade hard drive image with Mac OS 8.1 on it
I have an image, but it's too big. I don't have a good enough internet connection to send it. Sorry.
Amiga:
I don't know about any Amiga emulators for Be, but I have WinUAE and it works GREAT!
If you find UAE for BeOS, get Amiga In A Box. It's the perfect (free) set for Amiga emulation newbies. You will need a ROM file (Got that) and a copy of the Amiga Workbench files. (Got those too - email me for them!). After you have those, you can just fire up UAE and it should start working. It worked for me, but I'm using Windows.
- Active76