Sustainable Community Action aims to link up community and personal action for sustainability worldwide. Its content is licensed under GFDL, so it can be reused by anyone else, and we are volunteers building information and networks about sustainable lifestyle.
Some relevant features are: its software, the same one like Wikipedia, its flexibility, you can advertise, even organize your actions using the wiki, and its compatibility with inclusion of Youtube videos and GoogleMaps, that enables you to make a green map of your town or city, or bring a video from a conference or piece of news.