The Cloud Servers Application Porgramming Interface (API) allows developers to build their own unique solutions on top of Rackspace's infrastructure. Below are three examples of the numerous applications that have been built using the Cloud Servers API.
RightScale offers a fully automated cloud management platform that enables you to design, deploy, manage, and automate business-critical applications on the cloud. The Cloud Servers API allows RightScale's custom control panel to provision Cloud Servers automatically.
The Cloud Servers application for iPhone and iPod Touch allows you to easily and quickly administer your Cloud Servers on the go, wherever you are. The app uses the API to allow users to remotely perform a variety of tasks, including: adding, deleting, and rebooting servers.
rPath creates software that automates application deployment and maintenance across physical, virtual and cloud environments. rPath was able to bring their software to the Rackspace Cloud by making extensive use of the API.