| Operating system | Developer | First release | License |
|---|---|---|---|
| IBM 7090/94 IBSYS | IBM | 1960 | — |
| SHARE Operating System | SHARE | — | — |
| University of Michigan Executive System | University of Michigan | — | — |
| Operating system | Developer | First release | License |
|---|---|---|---|
| IBM 7090/94 IBSYS | IBM | 1960 | — |
| SHARE Operating System | SHARE | — | — |
| University of Michigan Executive System | University of Michigan | — | — |