Not sure what the original poster was planning to do with an alternative to GE. A nice tool based on NASA WorldWind with access to oceanography datasets is Virtual Ocean: http://www.virtualocean.org/
This was developed by researchers at Lamont-Doherty Earth Observatory of Columbia University. I have nothing to do with development of this but do manage some of the linked data sets.
Slashdot Mirror
Not sure what the original poster was planning to do with an alternative to GE. A nice tool based on NASA WorldWind with access to oceanography datasets is Virtual Ocean: http://www.virtualocean.org/ This was developed by researchers at Lamont-Doherty Earth Observatory of Columbia University. I have nothing to do with development of this but do manage some of the linked data sets.