Calamus

The Calamus is a companion for tabletop roleplaying games, such as Dungeons & Dragons or Pathfinder, that allows you to create huge battlemaps utilizing dozens of hand-drawn tiles, create custom PC, NPC, and FOE tokens, and host games in which players can add and move their own characters in real-time.

It also features a robust chat, in which you can send messages as yourself or any token you have in play, publicly or privately.