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Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux.
Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community are all hallmarks of the Gentoo experience.
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system... efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.
NetBSD is a free, secure, and highly portable Unix-like Open Source operating system available for many platforms, from 64-bit Opteron machines and desktop systems to handheld and embedded devices. Its clean design and advanced features make it excellent in both production and research ... [More]
The AROS Research Operating System is a lightweight, efficient and flexible desktop operating system, designed to help you make the most of your computer. It's an independent, portable and free project, aiming at being compatible with AmigaOS 3.1 at the API level (like Wine, unlike UAE), while ... [More]
EmuTOS is a single-user single-tasking operating system for 32-bit Atari computers and its emulators like ARAnyM, STonX or Hatari. It is thought as a replacement for the TOS-images you usually needed for running the emulators and it is also running on some real hardware like the Atari Mega STE. ... [More]
The FreeMiNT project develops a unix like kernel for Atari ST based computers. It is the successor of the MiNT operating system, developed by Eric R. Smith for Atari Corp. in the 1980s and 1990s.