Sites like mapforge-software.com

Tableplop, a free online virtual tabletop and toolset for pen-and-paper roleplaying games, with shared tokens, backgrounds and scene banners

Digital D20, a free virtual tabletop and markdown framework for creating tabletop role-playing game modules

The demonweb, a personal homepage of retro internet culture, digital empire essays, and a real-time location finder tool

A dungeon and cave map generator for virtual tabletop games, with automatic dynamic lighting tools, by its developer DunGen

Forgotten Adventures, a site selling tabletop RPG battlemaps, map assets and tokens, with a Clip Studio Paint mapmaking guide

Miska's Maps is an online shop selling sci-fi and fantasy battlemaps, spaceship deckplans and Foundry VTT modules for tabletop RPGs

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

A free browser-based drawing tool by Todd Ross for creating dungeon and terrain maps for tabletop RPGs

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

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

Mythic Table is an open-source virtual tabletop tool for online tabletop role-playing games, built by a volunteer team

Rolz, an online dice roller and minimal virtual tabletop for tabletop roleplaying games, with chat and initiative tracking

A hand-drawn TTRPG resource shop and blog offering battle maps, tokens and articles by a small team of artists

Gnome Stew, an English-language gaming blog with tabletop roleplaying advice, reading lists and podcast episodes written by several contributors

Runehammer Games, a tabletop RPG publisher and play room run by Brandish Gilhelm, with fantasy and sci-fi adventures, dice and miniatures

Blades in the Dark, a tabletop role-playing game of criminal crews in an industrial-fantasy city, with its free rules reference

Moonlight Maps is a shop selling fantasy, sci-fi and cyberpunk battle maps for tabletop roleplaying, started by Ollie in 2020

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

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

Michael Ghelfi Studios sells licensed tabletop RPG music and sound effects libraries, plus free game-master tools and a blog

Sly Flourish, a blog and newsletter by Michael Shea offering tips on running tabletop roleplaying games

Caeora's site offers... no, forbidden. Here is the sentence:

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

Happy Jacks RPG Network: a tabletop roleplaying game advice show, actual play podcast and video network since 2009

A blog by RPG designer David Flor on tabletop game design, AI chatbot hacking, and personal writing

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

Kanka, a worldbuilding and tabletop RPG campaign management web app built by a three-person team led by Jay, Jon and Kaz

Melodice is a crowdsourced website of music playlists for board games, with an about page by its maker

LITIENGINE is an open-source pure-Java 2D game development library and documentation site by developers Steffen and Matthias

Worldbuilding School: an online blog of guides and articles teaching authors, artists and game designers how to build imaginary worlds

A C++ microframework documentation site for Crow, a library for building HTTP and WebSocket web services

Ross Payton's blog and portfolio on tabletop RPG podcasts, books, zines, editing and graphic design

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

The official Dark Sun fan and publisher website, with news, Pristine Tower Dev Group publications and staff pages, run by the Athas.org Overcouncil

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

Possum Creek Games, an online shop selling tabletop role-playing games, books and zines in print and PDF

The Gauntlet is a publisher and podcast network of independent tabletop roleplaying games, with OSR-style fantasy modules, settings and video game-session roundups

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

A writing-craft blog by the WITS team, including Jenny Hansen, covering publishing, conflict and the writing life

A tabletop role-playing games podcast by Dan Repperger, with episodes on game-master and player topics

Xonsh, a Python-powered cross-platform shell and documentation site for its Python-based command language

libGDX is an open source cross-platform Java game development framework, with documentation, wiki, news and community game jams

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

Castle Game Engine, a free open-source cross-platform 3D and 2D game engine with a visual editor and Pascal API, documented in an online manual