Sites like freebsd.org

The NetBSD Project's home site for its free, portable Unix-like operating system, with documentation, platform lists, news and downloads

Can I use..., a reference site of browser support tables for web features such as HTML5, CSS3 and JavaScript

The Slackware Linux Project, a site documenting the Slackware Linux distribution with downloads, installation help, package lists, changelogs, FAQ and a book

Calomel.org is an open source reference site of Unix and BSD server tutorials and configuration guides, including DNS, NTP, Samba and Fvwm2 setups

Colin Percival's blog Daemonic Dispatches on FreeBSD, Tarsnap backups, security and miscellaneous musings, with a Route 53 Files tool

Manjaro, a Linux distribution built on Arch with rolling releases, with news and team pages by its core developers

The GNOME project's website, presenting its free and independent desktop computing platform and its community, in English and several other languages

Xmake, an open-source cross-platform C/C++ build tool and package manager configured in Lua

OPNsense, an open source firewall and routing platform project with release news, blog posts, donation information and a public roadmap

The MacPorts Project's official site offering a package manager for installing open-source software on macOS and other Unix-like systems

An international community developing free and open-source software, including the Plasma desktop and KDE applications

Alpine Linux, an independent lightweight Linux distribution built on musl libc and busybox, with its release announcements and documentation

Personal home page of Eric S. Raymond hosting his open-source software, FAQs, essays and the Retrocomputing Museum

The Rust Programming Language project's official site for the Rust systems programming language, with documentation, learning resources and community pages

The official home of Xfce, a lightweight desktop environment for UNIX-like operating systems, with release news and blog posts

Homebrew, a package manager for installing software on macOS, Linux and WSL from the command line

Solus, a rolling-release Linux distribution for desktop computers, with news, release announcements and policy pages

A French IT blog by Oleks covering Windows, Linux, SQL Server and Cisco tutorials

Lubuntu, the official home of the lightweight Ubuntu-based Linux distribution using the LXQt desktop, with release announcements and community links

OSNews, a long-running news and discussion site covering operating systems, computing, software development and technology news

Slax, a compact portable Linux operating system that runs from USB, with a blog by its author Tomas M

elementary OS is a Linux desktop operating system site, with download, release notes and app store pages for its distribution

iDeal OS, a privacy-focused Debian and MX Linux respin distribution with release news and bundled apps

A blog by Patrick Kerwood on Linux, Proxmox, Kubernetes and self-hosting tutorials, such as UPS shutdown and local development

EndeavourOS, a terminal-centric Arch-based Linux distribution project with its own community, news and ISO releases

Cacti, an open-source RRDTool-based network monitoring and graphing tool with a data collector called Spine

Linux Lite, a lightweight Linux distribution for beginners and older PCs, with German-language pages available at /de/

The official home of the Haskell programming language, covering its compiler GHC, build tool Cabal, installer GHCup and community resources

WinBoat is a software tool that runs Windows applications on Linux desktops through a Windows virtual machine integration

The official website for Nix and NixOS, covering the reproducible, declarative package manager and Linux distribution, with manuals and learning resources

TecMint, a Linux how-to blog with tutorials and guides by Ravi, founded in 2012

A blog and video archive on learning the Rust programming language, by Tim McNamara

Personal web site by Bruce Barnett collecting Unix and Linux tutorials, shell scripting guides and useful technical incantations

Libre-SOC project's open-source hardware system-on-chip design, documentation and codebase for a Power ISA processor with video acceleration

Linuxiac, an English news site covering Linux and open source software, plus guides to distributions like Fedora and Gentoo

Nextcloud, an open source self-hosted platform for file sharing and online collaboration as a Microsoft 365 alternative

A security-focused, compartmentalizing desktop operating system based on Xen, with project news, hardware compatibility list and documentation

Pittsburgh Supercomputing Center, a research computing center offering high-performance computing resources and news about scientific discovery since 1986