Mac OS 9
I'm the creator of the site, thanks for the submission.<p>This is an in-progress port of the SheepShaver emulator to WebAssembly/Emscripten, <a href="https://github.com/mihaip/infinite-mac/issues/34" rel="nofollow">https://github.com/mihaip/infinite-mac/issues/34</a> is tracking the remaining work.<p>If you're interested in running older Mac software in the browser, the BasiliskII-based sites at <a href="https://system7.app/" rel="nofollow">https://system7.app/</a> and <a href="https://macos8.app/" rel="nofollow">https://macos8.app/</a> may be better bets. They will boot faster and have fewer compatibility issues (especially System 7).<p>The main thing that Mac OS 9/SheepShaver brings is PowerPC support. There is also a variant of System 7 for PowerPC with more esoteric mid-90s Apple projects like OpenDoc and QuickDraw GX installed available at <a href="https://system7.app/?domain=system7-ppc.app" rel="nofollow">https://system7.app/?domain=system7-ppc.app</a>.