MasterScreen - MasterScreen is the ultimate set of tools for running tabletop or online roleplay campaigns and managing intricate fictional worlds. Free for everyone.
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming
Adventurer's Codex - A free, easy to use, in-person D&D 5e gaming system for characters, campaigns, and parties.
Tabletop tools - Handy tool collection for tabletop games
Aurora Builder - The Aurora Builder is a free tool that lets you create characters for your dungeons and dragons...
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.