• https://system6.app/
• https://system7.app/
• https://kanjitalk7.app/
• https://macos8.app/
• https://macos9.app/

besides the above five domains, https://infinitemac.org/ has multiple point releases of every major release of the Mac System Software from 1.0 onwards.

source code is here: https://github.com/mihaip/infinite-mac

@[email protected] - in case you see this - thank you so much for building this!