The history of computing is littered with the remains of forgotten operating systems—some rendered obsolete by technological progress, some that never quite captured the public imagination, and some ...
Andrew Warkentin's Virtual OS Museum packages 600-plus historical operating systems into a downloadable Linux VM, with Full and Lite editions for offline use.
Although Linux is the king of open-source OSes, there are options. Here you'll find a few open-source OSes to toy around with. Don't expect any of these to be viable options for daily use. When you ...