HardenedBSD Alternatives

OpenBSD is a free and open-source, security-focused, Unix-like operating system based on the Berkeley Software Distribution. For over 25 years OpenBSD has been developed by a community of volunteers funded through contributions collected by The OpenBSD Foundation. OpenBSD is freely available and can be used on most hardware, including Alpha, x86-64, ARMv7, ARMv8 (64-bit), PA-RISC, IA-32, LANDISK, Omron LUNA-88K, Loongson, MIPS64, PowerPC, SPARC64.

MidnightBSD is a free and open-source desktop operating system for x86 and x86-64 based PCs. The OS is originally forked from FreeBSD 6.1, and periodically updated with code and drivers from later FreeBSD releases. The developers behind MidnightBSD has been stringing since 2006 create an easy-to-use operating system that everyone can use, freely. 

GhostBSD is a free an open-source operating system based on FreeBSD. GhostBSD comes pre-installed with MATE desktop, OpenRC, the LibreOffice suite and OS packages for simplicity adn ease-of-use.

FreeBSD is a free and open-source Unix-like operating system descended from the Berkeley Software Distribution. FreeBSD was first released as in 1993, and is today the most popular free and open-source BSD operating system on the market today. In total, FreeBSD accounts for more than 75% of the market. FreeBSD can be installed easily on most machines and is licensed under the permissive BSD License.

A Linux distribution based on musl and BusyBox, designed for security, simplicity, and resource efficiency. Alpine Linux is mostly used in server environments as its hardened kernel and resource efficiency makes it perfect for containerisation. The distribution compiles all user-space binaries as position-independent executables along with stack-smashing protection for stack buffer overflow concerns.

Puppy Linux is a collection of multiple Linux distributions, built on the same shared principles, built using the same set of tools, built on top of a unique set of puppy specific applications and configurations and generally speaking provide consistent behaviours and features, no matter which flavours you choose.

Void Linux is an independent Linux distribution that uses the X Binary Package System package manager, which was designed and implemented from scratch, and the runit init system.

The Void (Linux) distribution. Void is a general purpose operating system, based on the monolithic Linux kernel. Its package system allows you to quickly install, update and remove software; software is provided in binary packages or can be built directly from sources with the help of the XBPS source packages collection.