One of the best software for world map in 3D

I like Celestia way better than the other ones.

http://sourceforge.net/projects/celestia/

Nasa world wind
- http://sourceforge.net/projects/nasa-exp/

, I guess - google earth is not bad too(hopefully not too offensive, Okay! Google Earth is wonderful, but I like Celestia way better than Google Earth. It's simple and doesn't consume all your processor - that's the main reason). It is always better especially because all the code and development is under open source community.
- http://earth.google.co.uk/

and microsoft world telescope are popular too.
- http://www.worldwidetelescope.org/

World Map Games Online:
http://www.muwasalat.com/2009/12/top-3-online-world-map-games-online.html

I think if You have interest in World Map related games, You'll definitely find the links useful. Divided them into categories so that You enjoy my effort.