FoundryVTT

Foundry Virtual Tabletop is a software that provides an innovative online role-playing experience. The software supports Windows, Mac, and Linux and allows you to self-host a game server that players connect to for free directly through a web browser. A one time purchase with no subscription fees or feature gating. As a self-hosted application, you have full control over your game experience and own your own data. We relentlessly innovate using modern web technologies to provide a powerful framework for users with a best-in-class API for developers. Website: https://foundryvtt.com/