Want to see the earliest resident monitors? The ancestor of all modern OSes (CTSS)? The earliest versions of Unix? The first OS with a desktop metaphor GUI (Xerox Star Pilot/ViewPoint)? Early versions of mainstream OSes? If you want to explore historical OSes and platforms without having to worry about configuring/installing emulators and OSes or corrupting emulated installations, you’ve come to the right place.
Just about every well-known OS and platform (and also a lot of obscure ones) is included in some form, spanning the entire history of stored-program computing from the Manchester Baby of 1948 (the first stored-program computer) to the present day.
associated blog post
https://andreww591.blogspot.com/2026/05/ive-released-virtual-museum-with-nearly.html?m=1
Back in the mid 90s i wasn't able to afford windows so i was using Geos (later renamed to 'New Deal Office'). Its what actually made me gravitate to Linux because one of my colleagues was surprised i wasn't using Windows. He was a huge Linux fan and recommended i try it.
TIL there was a 16-bit follow up to GEOS
https://en.wikipedia.org/wiki/GEOS_(8-bit_operating_system)