Free audio and video host. Partners with blip.tv and Internet Archive. Contains user-generated video. It can be browsed by subject-specific 'Channels' as well as by media type, comments, and categories such as 'most viewed'.
Finding free accommodations around the world. "We strive to make a better world by opening our homes, our hearts, and our lives. We open our minds and welcome the knowledge that cultural exchange makes available. We create deep and meaningful connections that cross oceans, continents and cultures. CouchSurfing wants to change not only the way we travel, but how we relate to the world!"
Free Public Domain classical music repository, that also provides streaming, sheet music and collaboratively writing a public domain music theory text book, it also permits submitting music to the collection.
AnarchistU brings together those who want to share their passion and interest in something and those who want to learn about it. We try to build free education that works against the traditional power hierachies of institutions and teacher/student relationships.