NASA World Wind is an open source 3D geospatial visualization platform. For over a year World Wind has enjoyed the attention of up to (and over) 80,000 downloads a day (of a 50+ MB program, thank you SourceForge!). Hundreds of plugins are available that extend this application every which way but loose. Although most are free and open source, this has not prevented entrepreneurs from providing value added proprietary products as well. NASA World Wind delivers access to terabytes of NASA data. The user is able to select from hundreds of planetary datasets for a variety of criteria including precipitation, temperature, ozone, etc. These can be date selected for full animations of daily data extending back several years. Experience the latest weather for the past month up to the last hour. Visit other planets or penetrate even deeper space to magnify twinkles of light into gorgeous spiral galaxies. NASA World Wind allows you to provide access to your data free or proprietarily. It's open source, have it your way.