Sites like dfir-iris.org

Pi-hole, a network-wide ad-blocking DNS server software project with installation guides and donation pages

RedPacket Security is an English-language infosec news site with tutorials and a merch store, covering hacks, breaches and cyber warfare

A French blog by Hackndo on offensive security, pentesting and blockchain, with articles on attacks like KRACK and password spraying

CyberGordon, a personal web tool that checks IP addresses, domains and file hashes against threat intelligence engines

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

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

fastlane is an open source tool for automating mobile app development, screenshots, beta distribution and store publishing

Typst, a markup-based typesetting system and online document creation tool for writing, automating and formatting reports and papers

Node.js, an open-source cross-platform JavaScript runtime for building servers, web apps, command line tools and scripts

Vale, an open-source command-line prose linter that checks documents against team style guides, by Vale Labs

Grist Labs' spreadsheet-based software for building secure no-code business apps, AI assistant, forms and case management

Leantime, an open source project management software for teams, with a mobile app in beta

Sean McArthur's personal blog and site on Rust, HTTP, async and open source, with consulting and short microblog posts

Vikunja, an open-source self-hostable task manager with lists, Kanban and Gantt views, with documentation and a Pro tier

Linkwarden, an open source bookmark manager for saving, annotating and preserving web pages, with apps and a browser extension

Zulip, an open-source team chat application with threaded async messaging, API documentation and help center, by Zulip developers

Saltcorn, an open-source no-code database app builder for creating custom business tools around your own data

HackTricks is a multilingual wiki of hacking and pentesting techniques, cybersecurity notes and AI security tricks, maintained as an open-source book

Mautic is an open source marketing automation software project and product, with its community hub on Slack

Personal website of Sebastián Ramírez, a Colombian software developer, sharing ideas, guides and his open source projects like FastAPI

Open WebUI, a self-hosted software platform for running and connecting AI models, with a user community and documentation

Stéphane Graber's blog on the Incus and LXC container projects, with release announcements and notes from Ubuntu and upstream work

Pelican is a free, open-source web control panel for hosting and managing game servers in Docker containers

GLPI is an open-source IT service management tool covering helpdesk ticketing, asset tracking and inventory management

A blog by rosesecurity@dev on cloud infrastructure, Terraform, Go, and security engineering practices

Wiki.js, an open source wiki software project for writing and publishing documentation, with versions 2.0 and 3.0

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

An open source C++ and Python toolkit and geometry engine for reading and writing IFC building information models

JSON Schema is a declarative language and documentation site for annotating and validating the structure and data types of JSON documents

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

WebdriverIO API reference documentation for the WebdriverIO browser and mobile test automation framework's commands and protocol bindings

LibrePCB, a free open-source electronic design automation suite for drawing schematics and designing printed circuit boards, with a blog and documentation

AI-powered, self-hostable photo and video management app PhotoPrism for browsing, tagging, searching and sharing media

OpenEMR, an open-source electronic medical record software project with demos, wiki, chat, and certification funding pages

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

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

The official website for the Go open-source programming language, with documentation, tutorials, and the Go Blog

Authelia is an open-source authentication and authorization server offering multi-factor login and single sign-on for web applications

The Oxc project's website describing a collection of open-source JavaScript tools written in Rust, including a compiler, with its team and sponsorship pages

A free open source procedural materials authoring tool using node graphs, with a website for sharing materials, nodes and brushes