Linux kernel is described as 'The Linux kernel is the core component of the Linux operating system. It's responsible for managing the system's resources and facilitating communication between hardware and software. It was first created by Linus Torvalds in 1991 and is open-source, allowing for' and is a very popular operating system in the os & utilities category. There are more than 10 alternatives to Linux kernel for a variety of platforms, including Linux, Mac, BSD, Self-Hosted and Windows apps. The best Linux kernel alternative is FreeBSD, which is both free and Open Source. Other great apps like Linux kernel are Linux-libre, OpenBSD, GNU Hurd and Redox.
ExectOS aims to be a stable and flexible, general purpose operating system written from scratch. It is designed to be modular, maintainable and compatible with existing software. It implements a brand new XT architecture and features own native application interface.
illumos is a free and open-source Unix operating system. It derives from OpenSolaris, which in turn derives from SVR4 UNIX and Berkeley Software Distribution (BSD). illumos comprises a kernel, device drivers, system libraries, and utility software for system administration.
Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.
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Good for retro-styled machines