AppScale is an open-source framework for running Google App Engine applications. It is an implementation of a cloud computing platform (Platform-as-a-Service), supporting Xen, KVM, Amazon EC2 and Eucalyptus. It has been developed and is maintained by the RACELab at UC Santa Barbara. AppScale allows users to upload multiple App Engine applications to a cloud. It supports multiple distributed backends such as HBase, Hypertable, Apache Cassandra, and MySQL Cluster. It has support for Python, Go, and Java applications, taking the open source SDK provided by Google App Engine and implementing scalable services such as the datastore, memcache, blobstore, user's API, and channel API.
The OpenStack Open Source Cloud Mission: to produce the ubiquitous Open Source Cloud Computing platform that will meet the needs of public and private clouds regardless of size, by being simple to implement and massively scalable.
ownCloud is a personal cloud which runs on your own server. ownCloud is a free and open-source software that you can install on your own computer or server, which includes file management with built-in file sharing (like Dropbox), music streaming, calendar, contacts and more.
ownCloud gives you freedom and control over your own data.
SparkleShare is an Open Source collaboration and sharing tool that is designed to keep things simple and to stay out of your way.