SoundCloud is a free community of artists, bands, podcasters and creators of music & audio. The music is mainly from unknown musicians who want to reach out to an audience, but there are exceptions like Paul McCartney and others. The quality is high and SoundCloud is integrated with social networking features.
If you want to create your own wiki, you can do it for free on Wikia.com. There are already over 200 000 different wikis about all aspects of popular culture.
Kickstarter is a crowdfunding site for US and UK based projects within art, comics, dance, design, fashion, film, food, games, music, photography, publishing, technology, and theater. Kickstarter does not allow charity, cause, or “fund my life” projects.
Project creators keep 100% ownership of their work. Backers are supporting projects to help them come to life, not to profit financially. Instead, project creators offer rewards to thank backers for their support. Backers often get a copy of the finished work.
If a project is successfully funded, Kickstarter applies a 5% fee to the funds collected.
Coursera is a social entrepreneurship company that partners with the top universities in the world to offer courses online for anyone to take, for free.