World building tools
World Anvil 
Realmworks 

Cartography Tools
Dungeonfog
Inkarnate
Dundjinni (old but very good)
Campaign Cartographer
(also check out: https://www.dnd-compendium.com/dm-resources/maps-map-tools)

Virtual Tabletops
(that i have with full license up to 8 persons)
FoundryVTT (with World Anvil integration)
Fantasy Grounds 
D20 Pro
EpicTable
Realmwork (not a full VTT but close)
(also check https://www.dnd-compendium.com/dm-resources/virtual-tabletops)