I guess I would be remiss if I didn't give a shout out to MapTool which has been around for ever and always free which is a great price! 
It's been a little sluggish on updates lately but we're trying to get some new releases out. We currently have a dev release here: http://forums.rptools.net/viewtopic.php?f=1&t=26736&p=263631#p263631
Along with a slew of new features/tweaks/fixes, one of the coolest I find is Vision Blocking at an "token" (or object) level, ie a Door can be set to block vision and the "VBL" moves with the door, so open the door, reveal the room!
I've also been working on PDF support, where MapTool can extract ALL the images (even maps from interactive modules from Paizo) from a PDF for use to build your map or tokens. Along with that there is a "Auto-Resize Map" function that helps you resize a map with grid's to align/resize to the MapTool grid.
I've been trying to think of a way to integrate Realm Works with MapTool and had a conversation with Rob at GenCon, but if anyone has any ideas, feel free to post em. I'm also looking into a deeper HeroLab integration with MapTool...

It's been a little sluggish on updates lately but we're trying to get some new releases out. We currently have a dev release here: http://forums.rptools.net/viewtopic.php?f=1&t=26736&p=263631#p263631
Along with a slew of new features/tweaks/fixes, one of the coolest I find is Vision Blocking at an "token" (or object) level, ie a Door can be set to block vision and the "VBL" moves with the door, so open the door, reveal the room!
I've also been working on PDF support, where MapTool can extract ALL the images (even maps from interactive modules from Paizo) from a PDF for use to build your map or tokens. Along with that there is a "Auto-Resize Map" function that helps you resize a map with grid's to align/resize to the MapTool grid.
I've been trying to think of a way to integrate Realm Works with MapTool and had a conversation with Rob at GenCon, but if anyone has any ideas, feel free to post em. I'm also looking into a deeper HeroLab integration with MapTool...