Macintosh.js is properly signed and notarized for modern releases of macOS, and runs a treat in Catalina. I’m off now to find some suitably Stuffited copies of some of my old apps. Trying this with uncompressed apps wasn’t successful, though, because macintosh.js didn’t recognise their modernised and flattened format. If you’ve got compatible Classic apps available in Stuffit archives, you can transfer those across using a shared folder too. There are also several tryout versions of Adobe apps like Photoshop 3, Illustrator 5.5, and Streamline 3.1. It comes pre-loaded with a bunch of game demos, including Oregon Trail, Duke Nukem 3D and Civilization II, but sadly not Crystal Quest. If you have the slightest interest in the history of the Mac, or in human interface design, it’s completely compelling. Although its author describes it as a “toy”, he does himself a disservice. It’s quite a hefty app at nearly 900 MB, but once started up runs a lot quicker than most Macs of the day. This allows you to run it in Windows and Linux too, if you really must. The purist might be ever so slightly offended to know that not only is this implemented almost entirely in JavaScript, but it runs in Electron. Do you fondly remember System 8, and the days of Mac Quadras with their Motorola 68K processors? Would you like one for free now? Felix Rieseberg, with the assistance of many others, has released his free macintosh.js, which is a virtualised Macintosh Quadra running System 8.