Overview
Foundry VTT is a self-hosted, modern virtual tabletop application that revolutionized the digital RPG space upon its release in 2020. Developed by Andrew Clayton, it recently celebrated its five-year anniversary with the launch of Version 13. Unlike its subscription-based competitors, Foundry provides a powerful, high-performance environment that runs in a web browser while giving the Game Master total control over their data and hosting. It is widely considered the "Gold Standard" for power users and tactical GMs.
Description
Foundry VTT is built on modern web technologies (Node.js and WebGL), allowing for hardware-accelerated visuals that outclass almost any other browser-based platform. It is a "buy-once, own-forever" product where the GM hosts the server locally or via a cloud service, and players connect for free through their browser. Its true strength lies in its modularity; with thousands of community-made modules, a GM can transform the software from a simple dice roller into a fully automated, cinematic video-game-like experience.
System Overview & Key Features
One-Time Purchase Model
There are no monthly fees or feature gating. Once you buy a license, you own the software and all future core updates. You can host an unlimited number of players, and they never have to pay a cent to join your games.
Dynamic Lighting and Vision
Foundry's lighting engine is best-in-class. It supports per-token vision, "fog of war" that persists between sessions, and complex light sources (like flickering torches or pulsing magical orbs) that interact realistically with walls and doors in real-time.
Extensive Module Library
The community has created over 2,000 free modules that add everything from "3D Dice" and "Animated Weather" to "Automated Combat" that handles math, resistance, and condition tracking automatically when a player rolls an attack.
V13 "ApplicationV2" UI
The 2025/2026 updates introduced a reimagined user interface. It is faster, more accessible, and allows for much better window management, reducing the "screen clutter" that previously plagued the software during complex sessions.
Self-Hosting and Data Privacy
Because you host the server, your maps, character sheets, and campaign notes are stored on your own hardware (or your chosen cloud provider). You aren't reliant on a third-party company's servers staying online to access your game.
Massive System Support
While it is famous for its "premium" level support for Pathfinder 2e and D&D 5e, Foundry supports over 200 different RPG systems, many of which feature official, high-quality modules from publishers like Free League and Paizo.
Additional links
foundryvtt.com 
https://foundryvtt.com - Official Foundry VTT website and Knowledge Base
forge-vtt.com https://forge-vtt.com - The Forge (The most popular specialized hosting service for Foundry)
r/FoundryVTT https://reddit.com/r/FoundryVTT : Active community for support and module discovery