Wave
Ahhh, remember the heady days of 2009? Google announced Wave, a real-time editing tool (largely developed in Oz!) that would finally hammer the nail into the coffin of email, collaboration and, erm, a bunch of other stuff. Less than a year, and perhaps a few thousand confused users later, Google pulled the plug. Now it’s open source, and called Apache Wave. One thing Apache has in common with the Google version of the product? No-one uses it.