#Roll20 is integrating #DungeonScrawl into the VTT to really upgrade live mapping.
This is great for #OSR groups where the players are mapping for themselves. Having grown up playing this way in B/X, it can be a pretty fun and immersive way to do things vs modern fog of war techniques.
#FoundryVTT has some add ons that are similar, but Dungeon Scrawl has much easier usability. I am so looking forward to this pushing all the VTTs forward in this department.