- Microsoft Windows (both desktop and mobile)
- Apple Systems (OS X and iOS)
- Linux-based Google systems (Chrome OS and Android)
- Ubuntu Linux (both desktop and mobile)
- other Linux systems (both desktop, e.g. Fedora, OpenSuse, and Linux Mint, and mobile, e.g. Firefox OS, webOS, Tizen, Sailfish OS, mer with Plasma Active, and the Android-based CyanogenMod)
- QNX (less important on the desktop, but used on phones in the form of BlackBerry 10)
- Amiga OS (yes it still exists, desktop only)
- RISC OS (used to be an important British operating system, desktop only)
- eComStation (the successor of OS/2, desktop only)
- Oracle Solaris (desktop only)
- FreeBSD (available for desktops as PC-BSD or GhostBSD)
- Haiku (the de facto successor of BeOS, although a separate development, desktop only)
When merging the scores from mobile and desktop systems, the top 3 winners are 1. Apple systems (OS X, iOS), 2. Microsoft Windows, 3. GNU/Linux (including the average score of all 7 non-Android but Linux-based mobile systems). Google follows on rank 4.
The table also includes an overview of other operating systems and their target devices.
If you spot any errors, please leave a comment.
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