Sites like tnode.com

Joey Hess's personal blog on Debian, software development, off-grid living and related technical projects

Rob Landley's personal site hosting his software projects such as toybox and Aboriginal Linux, plus his blog and essays

LibreMesh, a modular framework for building OpenWrt-based firmware for wireless mesh network nodes, with build guides and changelog

Keyoxide, a decentralized tool for creating and verifying online identities using cryptographic keys and profile pages

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

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

A cross-platform C library and command-line tools for communicating with iOS devices, developed as free open-source software

A German-language collection of open-source software services run by a private individual, ad-free and funded by donations

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

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

Dyne.org, a digital community and free software foundry blog covering open-source tools, art, ecology and decentralized networks, by Dyne.org

Bellingcat, an independent online investigations collective publishing open-source research, verification guides, and reports on power and accountability

Software and writing by Michael R Sweet, covering system monitoring tools, Mini-XML, and related programming projects

A free weekly email newsletter curating news and articles about the Perl programming language, archived from issue #1 in 2011

Unredacted, a non-profit building censorship-evasion proxies, hardened Linux infrastructure and privacy tools for open Internet access

UBports, a community site on Ubuntu Touch, an open source Linux mobile operating system, with FAQ, apps and jobs

Kismet, a wireless network detector and sniffer project with release posts, downloads and documentation by developer Mike Kershaw

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

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

Libretro, a project and website for the crossplatform application API behind the RetroArch emulator frontend, with news and forums

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

Mocha, a JavaScript test framework for Node.js and browsers, with its project documentation and API reference

Django Girls is a non-profit organization running free Python and Django programming workshops for women, with open online tutorials

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

hledger is an open-source plain text accounting tool and manual for tracking money, investments, and time with double-entry bookkeeping

LinuxFr.org is a French-language community news site and forum about Linux and free software, run by volunteer moderators

Low-tech Magazine: an English-language magazine on solar-powered, low-energy technology and sustainable living, with translated editions in German, French, Dutch and Turkish

Noisebridge, a San Francisco hackerspace whose wiki manual, guilds, events and projects are listed on its website

Branchable is a hosting service for Ikiwiki-powered websites, wikis and blogs built on Git

Syncthing, an open-source continuous file synchronisation tool, with project donation and foundation information pages

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

bunnie's burrow is a personal homepage and blog by bunnie, with an introduction and notes on her life and work

WinSCP, a free open-source SFTP and FTP client application for Windows file transfers between local and remote computers

Gajim, a free desktop chat app for the XMPP messaging protocol, with synchronized chats across devices

The LaTeX Project's website on LaTeX, the document preparation and typesetting system for technical and scientific publishing, with downloads, bug reporting, help and licence text

Free open source 2D CAD application LibreCAD for Windows, macOS and Linux, with community support and documentation

The FreeBSD Project's official site on the open-source Unix-like operating system, its downloads, documentation and community

The Open Co-op, a UK collaborative cooperative blog and project hub on regenerative economy, systems change and PLANET protocols

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

Scikit-learn, an open-source Python library of machine learning tools for predictive data analysis, with documentation, FAQ and installation guides