I am a big fan of wave in all its forms. Wave began with the Google Wave project, but now exists in the Apache Wave and Walkaround projects, among others. Below are a few of my wave-related projects. You can read more about wave, wave extensions, and available wave services, click here.
ExtensionsLive gadgets for use in waves. These add additional functionality not available in basic waves. They are also compatible with Google Shared Spaces.
Wave Extensions GalleryThe Wave Extensions Gallery is a repository of wave extensions independent of any specific wave service. It also has an API to allow developers of wave services to display extensions from the gallery in their own wave clients. In addition to the web site, there is also a Windows Store app, and a Chrome extension for searching the gallery within Rizzoma. Updates on the gallery get posted to Facebook and Twitter, and the source code is available on GitHub.
For developers: A better wave.uiIf you have developed wave gadgets (or follow the Wave Developer Blog), you have probably heard about and may have tried wave.ui, which is supposed to create wave-like panels and buttons. In my experience, however, this has been rather glitchy, so I have put together an alternative.
Wave WatchersThe Wave Watchers are a group of Wave users, early adopters of new technologies, developers, and bloggers with a common mission of promoting Wave in all its incarnations, helping Wave users, and encouraging the use of Wave technologies. (Partially copied from our Google+ page)