CrowdRise Challenges are competitions for charities and their passionate supporters to compete to win prizes from our amazing sponsors. Check out all the CrowdRise Challenges and get involved. If you’re a company or foundation or a really nice person who wants to sponsor the next CrowdRise Challenge, please email us right away. The Skoll Foundation, Mozilla Firefox, Groupon, The Huffington Post, Craigconnects, Martha Stewart and other incredible organizations have sponsored Challenges on Crowdrise. There’s no better way in the world to leverage your charitable dollars.