The MaxCDN PHP SDK is a development kit that lets developers integrate the MaxCDN API with their applications. With this SDK, developers can access the MaxCDN API using PHP, enabling direct access to the content delivery network.
Parse makes a great run at attracting developers to its platform and engaging them by providing clear documentation for the Parse API and SDKs. Making developer documentation and SDKs freely available is an excellent strategy, and a top notch strategy is important for this company.
StackMob has two obvious components in its value proposition to developers: providing boilerplate web application code and supporting APIs with deployment and versioning features. This is a space occupied by at least 5 companies, all still in beta.