People who don't know how to get an emulator working or find the Roms they need can click on the website and use the Javascript version to see what it was like on these old computers.

Some old software and operating systems were made free as in beer because they are so old.

Some Roms and disk images are still owned by programmers or the company that sold them or the underwriters who bought out the IP. You can contact them and see if they give permission to use them.