Roll20

Virtual tabletop for playing tabletop RPGs online

Freemium Gaming
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Game masters build maps, place tokens, and manage character sheets for systems like Dungeons and Dragons. Dynamic lighting and a built-in marketplace support rich scenes. Players join through a browser.

A free tier is available, and paid tiers add tools.

Foundry VTT and Fantasy Grounds are alternatives. Roll20 suits game masters running remote campaigns.