Sites like openscad.org

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

OctoPrint, an open source web interface for controlling and monitoring 3D printers, with a blog, help pages and merchandise by Gina Häußge

jdupes, a duplicate file finder tool by Jody Bruchon, with release news and articles on its development

Astroberry, an open-source Linux operating system for controlling astronomy equipment, from the Astroberry Project

CAD Sketcher, a free open-source add-on project bringing parametric CAD-style constraint sketching tools to Blender, with release notes and roadmap

A tool tracking Raspberry Pi computer stock across online vendors, built by a hobbyist maker who automates his own tasks

Klipper documentation: an English-language reference site for Klipper, firmware that runs 3D printers, with configuration and developer guides

Isabel's personal blog and portfolio on Nix, NixOS and related open-source projects, by a nixpkgs committer

An Italian blog by Leonardo Miliani on retro and modern tech news, with programming book announcements

Autodesk's corporate site selling 3D design, engineering, construction and media software such as Fusion, Revit and Forma

Hackaday.io, a community platform where makers publish and share open hardware development projects and build logs

Grid.Space is a web-based digital fabrication toolkit for CNC, laser, and 3D printing, built by Kiri:Moto

A news blog on embedded systems, maker boards and single-board computers such as Raspberry Pi and Arduino, run by CNX Software Limited

BigPrint, a downloadable software tool by Woodgears for making large-scale 1:1 print mosaics from images

A Rust framework called Yew for building component-based interactive web frontends, with documentation and a playground

A catalog of open source JSON, YAML and TOML schemas used by editors and tools for validation and completion

Software Freedom Day, an annual worldwide celebration of free software run by the Digital Freedom Foundation, with multilingual event listings

The Dhall programmable configuration language, its typed functions, imports and tooling, documented on its official project website

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

The Battle for Wesnoth is an open source, turn-based fantasy strategy video game, with its project's developer documentation and release notes

PhotoDemon, a free, portable, open-source photo editor for Windows, with release news and download pages

OpenShot, a free open-source video editing software for Linux, Mac and Windows, with a project homepage and multilingual pages

JSCAD, a JavaScript tool for creating 3D designs by writing code, with exports for 3D printing

A French-language project page for Armbian, an open-source Debian and Ubuntu Linux distribution for ARM single-board computers

Twisted, an event-driven networking engine written in Python, distributed under the MIT open source license

SmartHomeScene is a smart home blog with reviews, DIY Home Assistant and ESPHome projects, news and guides

Free open source software for video recording and live streaming, the OBS Studio download and project site

A personal blog on software, embedded systems and Rust, plus the author's own projects

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

Joplin, an open source note-taking app with multimedia notes, web clipping and end-to-end encrypted sync, developed by Laurent

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

AmeraLabs, a European manufacturer's company site selling 3D printing resins for miniatures, dental and engineering, with a blog and safety data sheets

DietPi, a lightweight minimal Debian operating system image for single-board computers, with a blog, documentation and usage statistics

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

MSYS2 is a software distribution and build platform for Windows providing Unix-like tools, compilers and package management documentation

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