Great info on different projection techniques for VR video on Paul Bourkes site: paulbourke.net/dome/panodome/
A implementation of a render cam based on this in Blender: blender.org/manual/game_engine/camera/dome.html
A script for generating Unity cubemaps in Max/Vray:
TileMill is a free Open Street Map Renderer for OSX, Linux, Ubuntu. It allows to edit the styling off the map in a comfortable editor. Maps can be exported to PNG, PDF, SVC etc.
Maperitive is annother application in this category. It’s also capable of exporting 3D Terrain Data as a textured COLLADA mesh