After a bit of research FS-UAE seems to be the best emulator I have found. It supports multiple platforms and comes with a replacement ROM. Though you still need a real ROM to play some of the software.
Here is the emulator and getting started instructions: https://fs-uae.net/ , https://fs-uae.net/docs/getting-started
You can buy ROMs here: https://www.amigaforever.com/value/
And find games here: https://www.exotica.org.uk/mirrors/ami_sector_one/
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