We report CRdata.org, a cloud-based, free, open-source web server for running analyses and sharing data and R scripts with others. In addition to using the free, public service, CRdata users can launch their own private Amazon Elastic Computing Cloud (EC2) nodes and store private data and scripts on Amazons Simple Storage Service (S3) with user-controlled access rights. All CRdata services are provided via point-and-click menus.