AppScale is an open-source hybrid cloud platform. AppScale implements a number of popular APIs including those of Google App Engine, MapReduce (via Hadoop), MPI and others. AppScale automatically deploys over the Amazon EC2 public cloud, OpenStack/Eucalyptus private clouds. AppScale has been developed and is maintained by the RACELab at UC Santa Barbara. AppScale executes applications written in the Python, Java, and Go programming languages. Sponsored by Google, NSF, and IBM.