Sites like katsbits.com

ShareTextures offers a free library of CC0 PBR textures and 3D models by Olga Antonenko, a texture and model catalogue

World of Level Design is a tutorial site on level design and game environment art, run by Alex Galuzin since 2008

A free library of photoscanned PBR textures and materials for 3D artists, with Blender and Unreal Engine tutorials

A German website on gamer hardware and IT background, news, and analysis, plus tools like aTuner and nHancer

A collaborative online library of user-uploaded sound effects and field recordings under Creative Commons licences, with forums, charts and search

VCV Rack, a free Eurorack modular synthesizer simulator for Windows, Mac and Linux, with paid VCV add-on modules

A game development news blog by Mike Jennings covering engines, tools, free assets and tutorials

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

Free game assets, tools and games by Kenney, a studio producing 2D and 3D art for game developers

War and Peas is a German webcomic by the duo Elizabeth Pich and Jonathan Kunz, released every Sunday since 2011

Interplanety, a collection of Blender 3D tutorials and notes alongside small online tools such as ArtCards and Drevodel

A browser extension called AdNauseam that clicks every ad to obscure tracking by advertising networks, with press and privacy pages

Tiled, a free flexible level editor for designing 2D game maps, with its news and documentation pages

An online database of scanned illustrations from old books, mostly 19th and 20th century, published by Old Book Illustrations

A free library of PBR textures, HDRIs and 3D models for download, run by the ambientCG project

MonoGame, an open-source cross-platform C# framework for game development, run by the non-profit MonoGame Foundation with its news blog

jMonkeyEngine is an open-source Java game engine with a code-first SDK, documented through a quick start guide and community forums

OpenSCAD is free software for creating solid 3D CAD models by coding, with news and gallery pages

Ogre3D, an open source C++ 3D graphics rendering engine with news, community forums, a legacy wiki and support

A French gaming news and reviews site by NoFrag, covering games such as Hellraiser: Revival and Escape From Tarkov

The PHP Foundation is a collective supporting development, security and long-term prosperity of the PHP programming language

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

Poly Haven is a free public library of HDRI lighting maps, PBR textures and 3D models by Rob Tuytel

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

It's FOSS is an English-language blog on Linux tips, tutorials, applications and news, written by Abhishek Prakash

Sketchfab, a platform where 3D creators host, share, embed and sell 3D models and AR experiences

XMission is a Utah internet service provider offering fiber internet, business connectivity, web hosting, SSL certificates and the XWi home WiFi service

Urban Terror, a free multiplayer first-person shooter game and community site with developer news and tournament announcements

Darling, an open-source translation layer for running macOS software on Linux without a hardware emulator

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

A Firefox-based web browser project, built by a group of developers and designers focused on productivity and privacy

Architecture portfolio of Yorik van Havre and Maíra Zasso, architects, with renderings, 3D models, drawings and walkthrough animations

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

Invoke, a free open-source self-hosted engine for AI image generation, with releases and developer documentation

SheepIt is a free distributed renderfarm service that lets users render Blender projects through their browser

Monitor Tests, a site by ToastyX offering software for tweaking display resolutions and timings, with a community forum

Morevna Project blog on open-source animation and artwork by Anastasia Mayzhegisheva, with Pepper&Carrot motion comic source files