I'm looking for a piece of software that will allow me to show a player map on an external monitor and a GM map on my laptop screen. I don't want to be dragging the player map back and forth from screen to screen. I want to be able to update the GM map – move pieces, fog of war, stuff like that – and have the player map auto-update. Anyone have any ideas?
Battlegrounds hosts a table comparing popular virtual tabletop software. One of the comparison lines is whether it's "Suitable for offline use".
Based on the comparison, the best bet is MapTool since it explicitly notes that it supports dual map windows so that the player map can be moved onto an external monitor. The other entries indicate support for in-person uses, but are less descriptive about how that works (one notes that it supports this use, but only has one map window). MapTool has the distinct advantage of being free, so you can easily see whether it suits your needs.
Take any virtual tabletop tools, setup a GM instance, and a player instance on the laptop and use the localhost address, 127.0.0.1, to connect the player instance to the GM instance. The localhost address doesn't require a network to be hooked up. I have done this on Fantasy Grounds. I believe Maptools can do this as well.
Dungeonpilot is an online tool to paint dungeon maps and to explore the dungeons during a role playing session, using two computers. Preferably, one of the computers is a table computer on which the players can see the already explored parts of the map, while the other computer is used by the master to reveal the dungeon map to the players. Having one computer with two monitors and two browser windows will work too.
I'm the developer of Dungeon Pilot.