Sites like gurpscharactersheet.com

A collection of free online tools for the GURPS 4th Edition tabletop roleplaying game, including dice, damage, hiking and trait calculators

Arc Dream Publishing, a small publisher of tabletop role-playing games including Delta Green, The Black Company and Godlike

Fate SRD, a website of articles, tabletop RPG rules and game products for the Fate roleplaying system

Subclassed, a Mac and iOS app developer by Stefan Keller, making utilities that convert contacts and calendars

One Seven Design Studio, a small studio publishing tabletop roleplaying game modules such as GHOST/ECHO and Ghost Lines

Music Presence, a desktop app and project by Hannah that shows your Discord friends what music you are listening to

Giant in the Playground Games is a webcomic publisher and shop for Rich Burlew's Order of the Stick comic and merchandise

A personal homepage by illustrator Winchell D. Chung jr. on 3-D starmaps, wargame artwork, and obsolete scientific instruments

Brattoo Propaganda Software, a company making Apple Photos utilities such as the Duplicate Annihilator duplicate-finder, plus free apps and support pages

Rusty Quill is a podcast production company and network whose shows include The Magnus Archives, with news and staff pages

The Alexandrian, a blog by game designer and author Justin Alexander on tabletop RPGs, books, comics and films

Mouseless, a desktop utility for controlling the mouse pointer with the keyboard, sold by Sonuscape

Tales of Maj'Eyal, a topdown tactical roguelike RPG game, and the T-Engine4 Lua game engine behind it

Paizo, publisher of the Pathfinder and Starfinder tabletop roleplaying games, card game organized play, and related fantasy and science-fantasy products

Foundry Virtual Tabletop, a self-hosted software platform for running online tabletop roleplaying games, with knowledge base and API documentation

Spikey Bits is a news and articles website covering Warhammer 40k, Asmodee and GMM Studios tabletop miniature gaming

PsychoPy: open-source Python software and documentation for building and running psychology and neuroscience experiments, with a graphical Builder and scripting

massCode is a free, open-source, local-first developer workspace app for snippets, notes, API requests, diagrams and calculations

Original 10-minute ambient soundscapes and music for tabletop role-playing games, a free audio site funded by Patreon

Panix, a New York internet service provider since 1989, offering dial-up, email, web hosting and UNIX shell accounts

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

Pilotmoon Software, a one-person Mac software business run by Nick Moore, making PopClip and utilities with a blog

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

libjpeg-turbo is an open source JPEG image codec project using SIMD instructions to speed up JPEG compression and decompression

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

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

Thorium Browser, a fast Chromium-based web browser for Linux, Windows, macOS, Android and Raspberry Pi, with developer tools and demos by its maker

Bay 12 Games, the independent developer's site for Dwarf Fortress and other games, including Liberal Crime Squad and WWI Medic, by Tarn Adams

VirtualGL, an open-source project providing GPU-accelerated 3D rendering to remote X11 clients, with news, documentation and package repositories

5ire is an open-source desktop AI assistant and MCP client software application with a privacy policy and documentation

Atlas Games, a tabletop game publisher whose site covers its card and board games, news, and fundraising events

Kivy, an open-source Python framework for building cross-platform GUI apps, with a project blog, about page and documentation

EN World is a community news, reviews and forum site covering Dungeons & Dragons and tabletop roleplaying games, with a shared wiki

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

OpenRefine is a free, open source desktop tool for cleaning, transforming and extending messy data

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

A French website of Dungeons & Dragons 5e reference material, rules, tools and unofficial game aids, run by Mr. Prankster

Shamus Young's personal website: blog essays on PC games and hardware, plus serialized novels and music by the programmer