This might be off topic - but I've been using the ultimate abondonware -
A PC emulator for the Digital Equipment Corporation Dec-10 mainframe
(which I used back in college in 1983). It ran TOPS-10 which I feel is the best OS ever created.
The free hardware emulator runs on Windows, and emulates the hardware of the original PDP-10 from DEC,
which runs the original Tops-10 OS and genuine Pascal, Fortran, Lisp, APL compilers which I learned
computer science on.
Not sure if you're old enough to have worked on these old mainframes, but they were the best computers
I've ever used. I don't think any malware could attack a 36 bit OS like Tops-10 running on a Windows hardware