BOOTDISK SETUP INSTRUCTIONS - IBM
OS/2 WARP Version 3
The IBM files you download are self extracting WinImage files. You need Windows 95, 98, or NT for the extraction program to work. Put a clean floppy disk in your A-Drive and click on the file to make the setup disks.
USE OF DISKS: To use your newly created OS/2 boot disks, you will need to start your computer with disk 1 in the drive. Wait until a blue screen appears depicting the IBM logo. That screen will inform you to place disk 2 into the drive (actually refered to by them as disk 1) Place the second disk in your drive, and press the appropriate key.
After you do this, a few rows of odd characters will appear on the screen in blue. A few minutes later, you will be brought to an OS/2 command line interpreter. This interpreter works similar to DOS, but it can access OS/2 HPFS hard disks, and can be used to partition or format drives for use with OS/2.
Thanks to Amos Vryhof for the file and instructions.
DOS 4.00 And PC DOS 7.0 
Just click on the file. Thanks again to Amos for 7.0.
Redhat Linux 2.0+
For Redhat Versions 2.0 and above. Download, click to unpack, type makedisk and follow the onscreen direction.
Redhat Linux 6.1 And Version 9
Self extracting winimage files. Put a fresh new floppy disk in your 1.44 drive and click the .exe to create the bootdisk.
Download, click to unpack, type makedisk and follow the onscreen direction.
This disk is bootable and can be compared to a SuSE Linux setup disk but is capable as a great system analyzer. Once booted you may can enter several menus and load so called modules, which are comparable to drivers. You need to load the appropriate drivers if you want to install linux, but, once loaded, they tell you everything about the hardware they support.
If you want a complete check, run the 'probe all' command to see what linux detects. At the kernel messages you'll see what the kernel detected and detailed information obout what it finds. So if you don't know parameters of a hdd and the bios does not have autodetect, run this disk and you'll be fine.
Thanks to Johannes for the file.
System 7.01 and 7.5
Here is the guts on how to use them. mac750.bin The .bin file is called MacBinary which is a common format for distributing macintosh files on the internet. To expand it on a mac you need Stuffit Expander which every mac has on a standard install as it is the winzip of the mac world.
You can get a PC version "Alladin Expander" from http://www.aladdinsys.com I expanded the .bin on my PC using Alladin Expander and it contains a long readme from Apple (dated 1994) and a disk image file "Network Access.image". The disk image file can be written to a floppy using Apples Disk Copy program (a utility for creating, mounting and writing disk images) which is also a standard install on all Macs. mac701.zip This one seems to be set up more for the Mac emulator on a PC user, hence the ZIP file.
I believe the included .dsk file can also be read and written to a floppy with Apple's Disk Copy on a Macintosh. If you are on a PC you can get HFV Explorer, a free PC utility for reading and writing all Macintosh media, at http://gamma.nic.fi/~lpesonen/HFVExplorer/
This program can read the contents of the .dsk files, display the macintosh icons and write the image to a floppy. Amazing. This basically does what MacOpener or some of the other commercial programs for reading Mac media on PC's do, but it is free.
One more thing. The System 7.01 doesn't contain networking support like the 7.5 does. These probably wont work on new G3 Macintoshes like iMac, hence the 1994 comments.
More Downloads Here.
Thanks to Mac for the files and instructions.