Roll20 is a website offering tools for playing role-playing games on a remote table, in particular a virtual game table.
Here you will find links to virtual tabletops. If you know other links, don't hesitate to suggest them on the home page!
Foundry VTT is a standalone application built for experiencing multiplayer tabletop RPGs using a self-hosted application where players connect directly through the browser.
Fantasy Grounds is a virtual tabletop application, which contains a set of tools to help tabletop RPG players play in person or remotely