| operating system | 1,133 |
| Linux distribution | 811 |
| mobile operating system | 119 |
| software version | 83 |
| free operating system | 79 |
| Unix-like operating system | 71 |
| proprietary software | 37 |
| Android distribution | 36 |
| free software | 36 |
| open-source software | 36 |
| lightweight Linux distribution | 32 |
| real-time operating system | 30 |
| macOS | 26 |
| embedded operating system | 23 |
| Unix | 22 |
| operating system distribution | 21 |
| BSD | 19 |
| UNIX 03 | 18 |
| Debian | 16 |
| supercomputer operating system | 16 |
| free and open-source software | 14 |
| iOS | 14 |
| network operating system | 14 |
| distributed operating system | 13 |
| security-focused operating system | 13 |
| proprietary operating system | 12 |
| system software | 12 |
| watchOS | 12 |
| computing platform | 11 |
| software | 10 |
| tvOS | 10 |
| DOS | 8 |
| business | 6 |
| hobbyist operating system | 6 |
| version, edition or translation | 6 |
| hypervisor | 5 |
| iPadOS | 5 |
| Live CD | 5 |
| Research Unix | 5 |
| abandoned project | 4 |
| Android | 4 |
| Android One | 4 |
| BIOS | 4 |
| Classic Mac OS | 4 |
| disk operating system | 4 |
| microkernel | 4 |
| model series | 4 |
| smartphone model | 4 |
| trademark | 4 |
| AmigaOS-like operating system | 3 |
| application software | 3 |
| computer program | 3 |
| cross-platform | 3 |
| firmware | 3 |
| graphical user interface | 3 |
| Linux on embedded systems | 3 |
| live distribution | 3 |
| Microsoft Windows | 3 |
| mobile app | 3 |
| open hardware | 3 |
| organization | 3 |
| over-the-top media service | 3 |
| software project | 3 |
| utility software | 3 |
| Windows 10 edition | 3 |