OpenBSD Operating System
OpenBSD is a free, open-source, modern, compact, security-focused and multi-platform UNIX-like operating system based on 4.4BSD OS. It is a compact and complete operating system (more than "Just a Kernel") if compared with the Linux system base. Because of it's unique archiecture it is one of the most secure operating systems which had "Only two remote holes in the default install" since (it was launched) a very long time ago.
Linux Operating System
Linux is an open source and free (but there are also few non-free commercial distros), modern, Unix-like operating systems based on the Linux Kernel. There are many linux distributions, the most popular are: Debian Linux, Mint Linux, Ubuntu Linux, CentOS Linux, Fedora Linux, RedHat Linux, SUSE Linux, OpenSuSE Linux. Linux provides many advantages over other operating systems: open-source software available for everyone to contribute, modify, and enhance the source code. It is also available for users to download and use freely. Linux is less vulnerable and more secure than other operating systems.
MacOS Operating System
Apple MacOS is a modern, proprietary Unix-Like operating system developed and marketed by Apple Inc., designed for Apple's Mac computers. The base of MacOS (previous named Mac OS X, called "Darwin") is based on FreeBSD and Mach and still incorporates improvements from recent versions of FreeBSD.
Windows Operating System
Microsoft Windows, commonly referred to as Windows, is a modern, proprietary operating system developed by Microsoft Corporation. The modern versions of Windows are built in the top of Windows NT Kernel, as a layered design that consists of two main components: user mode and kernel mode.
iOS Mobile Operating System
iOS is a proprietary mobile operating system created and developed by Apple Inc. exclusively for its hardware. This mobile operating sistem is a UNIX like operating system based on Darwin (initially derived from FreeBSD) and macOS. It is the operating system that powers many of the company's mobile devices, including the iPhone, iPad and iPod Touch. It is the world's second-most widely installed mobile operating system, after Android.
Android Mobile Operating System
Android is a mobile, linux like, operating system based on a modified Linux Kernel (long-term support LTS branches) and primarily designed for mobile devices and touch screen devices such as mobile phones, tablets and other similar devices, includding Chromebook. It is the most used mobile operating system in the world in the last 10 years, having a large market share.
NetBSD Operating System
NetBSD is a free and open-source Unix-like operating system based on the Berkeley Software Distribution. It was the first open-source BSD descendant officially released after 386BSD was forked. It is a highly portable operating systems that can run on more than 55 CPU platforms includding: xen, amd64, evbarm, evbmips, evbppc, hpcarm, sparc64, alpha, amiga, atari, cobalt, emips, hpcmips, ia64, ibmnws, iyonix, macppc, sgimips, ...
FreeBSD Operating System
FreeBSD is a free and open-source Unix-like operating system descended from the Berkeley Software Distribution, which was based on Research Unix. Cutting edge features - offers advanced networking, performance, security and compatibility features today which are still missing in other operating systems, even some of the best commercial ones.
Open Solaris Operating System
OpenSolaris is an open source but proprietary (CDDL) computer operating system based on Solaris and created by Sun Microsystems. The project itself was discontinued but there are several forks of this operating system that have been continued and are modern and up-to-date: * OpenIndiana * Illumos * SmartOS * Oracle Solaris.