Fantasy Grounds is described as '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' and is a virtual tabletop in the games category. There are more than 50 games similar to Fantasy Grounds for a variety of platforms, including Web-based, Windows, Android, iPhone and Linux apps. The best Fantasy Grounds alternative is Virtual Battle Mat, which is free. Other Fantasy Grounds like games are FreeVTT, Roll20, D&D Beyond and DiceRight.
Virtual Battle Mat is a browser virtual tabletop built for simplicity: players join from one link with no account and no download. Signature isometric 3D minis and hand-drawn maps from partner artists, all human-made. Free tier included; works with any rules system.
FreeVTT is a free virtual tabletop with hosting, dynamic lighting, and local storage that is built for playing D&D and other tabletop RPGs without subscriptions, accounts, or cloud services.
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!
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...
DiceRight is an online platform for playing tabletop games. It tracks game aspects like turns and damage to speed up gameplay and eliminate tedious elements. The platform offers extensive customization, including character classes, races, game currencies, and languages.
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.
MasterScreen is the ultimate set of tools for running tabletop or online roleplay campaigns and managing intricate fictional worlds. Runs on every device without any downloads. Built by nerds and free for everyone.
Cauldron VTT is a web application to run tabletop role playing games, like Dungeons & Dragons and Pathfinder, online.
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.
Rolisteam helps you to manage tabletop role playing games with remote friends/players. It provides many features to share maps, pictures and it also includes tool to communicate with your friends/players.
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Really good free tool to manage your tabletop game, doesn't come with with many predefined rulesets, but it's very flexible in creating these, so you can even play with your own ruleset