The Apache Software Foundation, that is, not an ominously portentous, Wagner-blaring helicopter.
The beleaguered Wave project, which Google has ceased developing, will soon shut down. Last week, Google gave us the ability to export our existing waves as Zip files, and now, thanks to Apache and the Wave in a Box off-shoot, you may soon have somewhere to import them to. It won't be exactly the same as Google Wave, but it could be pretty damn close.
The Register is reporting that the Apache Software Group is looking to roll Wave in a Box into its current management and build systems. It's currently only in the incubator phase, but the the full proposal for Apache Wave reads like a serious, concerted effort. There are a ton of Googlers on the list of code committers, at any rate.
If all goes to plan, you may soon be able to easily set up your very own Wave server, for internal collaboration efforts. Who knows, maybe big-name email and instant messaging providers like Microsoft, Yahoo and Google will one day provide an end point for our waves!