Dungeon Painter Studio is a powerful encounter map design tool, with a lot of features:

• Tilesets for indoor, outdoor and world maps
  
• Easy export to roll20, Fantasy Grounds, Tabletop Simulator and other VTT
  
• Layers and groups
  
• All objects are editable
  
• Union and subtraction operations
  
• Customizable filters (Drop Shadow, Glow, Bevel, Tint...)
  
• Easy import of custom art
  
• Sketchs import
  
• One click D20 random generator dungeons import
  
• Export to multipage pdf for print
  
• 1 inch, 1.5 inch & 1 cm grids
  
• A4, A3 and US Letter page
  
• Square and hex grid types