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Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.

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D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming

Kinguin - Marketplace to buy/sell game keys for a myriad of platforms including: Battle.

Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person