Beyond Tabletop
Roll20
Astral Tabletop
Fantasy Grounds
MapTool
D&D Beyond
Rolisteam
PlanarAlly
Adventure Builder
D&D Beyond
Adventurer's Codex
Dungeon Masters Vault
Aurora Builder
DiceCloud
Roll20
Critical Compendium
Beyond Tabletop Adventure BuilderWhile many of us have become pampered by DND Beyond's rulebook integration, Beyond Tabletop brings us back to our basics. By removing the integrated rulebooks they allow for every feature to be homebrewed and managed how you and your DM desire. In my findings it is the best tool out there as far as capturing the feel of pen and paper while also giving the versatility and ease of access of the internet.
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
Adventurer's Codex - A free, easy to use, in-person D&D 5e gaming system for characters, campaigns, and parties.
Fantasy Grounds - Fantasy Grounds is a virtual tabletop to help facilitate play of tabletop-style role-playing games...
Dungeon Masters Vault - Extensive tool set for D&D 5e dungeon masters.