To add to the pile I'll give you a couple others that I know of. There's http://www.aeolusproject.org/ which is actually based off of Deltacloud which someone else already mentioned. It's basically a nice GUI/toolset for working with multiple clouds... and quietly backed by RedHat, so there is that.
There are of course also the application management tools like the recently announced CliQr and Rightscale. Both of those work with several different clouds (both private and public).
There are of course also the application management tools like the recently announced CliQr and Rightscale. Both of those work with several different clouds (both private and public).