Apps similar to TTRPG Helper include Roll20, which has a free version. Other options are D&D Beyond, Foundry Virtual Tabletop, Owlbear Rodeo and MapTool. In total there are six Virtual Tabletops like TTRPG Helper for the web, Windows, Linux, iPad and Mac.
Roll20 is the free, easy way to play tabletop games (such as pen and paper RPGs) online with others. It's completely web-based, so it runs right in your browser. It supports video and voice chat, background music, character sheets, a massive art library, and more!
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D&D Beyond is the official digital toolset for Dungeons & Dragons fifth edition. Twitch integration and a massive online compendium of official characters, spells, items and more provide an easy to use system with everything dungeon masters and tabletop D&D gamers...
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Foundry VTT is a standalone application built for experiencing multiplayer tabletop RPGs using a feature-rich and modern self-hosted application where your players connect directly through the browser.
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Owlbear Rodeo is an attempt to make a web app to run tabletop encounters without the complicated setup process needed for other VTTs.
MapTool is an online, multiuser, networked, graphical, interactive, programmable virtual tabletop. Requires Java 6+. It can be used for face-to-face play, or Internet role-playing in real time even if your players are on the other side of the world.
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Fantasy Grounds is a virtual tabletop to help facilitate play of tabletop-style role-playing games online with a GM (game master) and one or more players. It replicates what you would traditionally do around a physical table, such as rolling dice, managing character sheets...
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