Google Wave was a collaborative communications tool introduced by Google at the 2009 I/O Conference. The technology combines real time chat with wiki-type editing of any "blip", or individual wave segment. There are also "robots" that automate tasks inside waves. They are hosted at Google App Engine right now (which means you are necessarily limited to Java and Python), but in the future any website correctly set up for robot hosting will work. There are also "gadgets". A gadget is a small application that runs within a client. The gadget is owned by the wave, and all participants on a wave share the same gadget state.