From the description it seems like exactly what OpenStack provides (even regarding architecture, access to own network, etc.). The only place where it's explicitly mentioned is the blog (http://nebula.nasa.gov/blog/2011/may/nebula-team-releases-ne...) They might be running something more recent than Bexar though, since that one's rather old and doesn't provide many features required for large-scale operation.
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From the description it seems like exactly what OpenStack provides (even regarding architecture, access to own network, etc.). The only place where it's explicitly mentioned is the blog (http://nebula.nasa.gov/blog/2011/may/nebula-team-releases-ne...) They might be running something more recent than Bexar though, since that one's rather old and doesn't provide many features required for large-scale operation.