Top 7 products relevant to Virtual Tabletops and Game Engine

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

Open Source

Tableplop is an easy to learn, fun to use virtual tabletop for role playing games. It includes everything you need to play TTRPGs remote apart from audio chat and works great on mobiles and computers.

A simple DnD content viewer app.

Interactive companion for dungeon masters.

Extensive tool set for D&D 5e dungeon masters.

Open Source

Cross-platform Game Master tools to track campaign notes, compendiums and a battle map.

In-game tabletop RPG assistant to take care of administrative tasks.