Beyond Tabletop
Roll20
Astral Tabletop
Fantasy Grounds
MapTool
D&D Beyond
Rolisteam
PlanarAlly
PyMapper
Campaign Cartographer
Fractal Mapper
Dungeon Tile Mapper
Tiamat
Inkarnate
donjon.bin.sh
DUNGEONFOG
Beyond Tabletop PyMapperWhile 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.
Campaign Cartographer - Campaign Cartographer is the leading map making software for games (RPGs, miniatures and wargaming).
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
Fractal Mapper - With Fractal Mapper, creating worlds has never been so easy!
Fantasy Grounds - Fantasy Grounds is a virtual tabletop to help facilitate play of tabletop-style role-playing games...
Dungeon Tile Mapper - Dungeon Tile Mapper is a web based tile mapping tool that includes many official D&D tile sets.