Abstract
Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) are generic services that can be used by developers for creating new applications which can themselves be accessed as a service. These cloud services which deliver application software as a service fall into the category of Application as a Service, more commonly known as Software as a Service (SaaS). This chapter studies some examples of popular SaaS applications that not only provide service-enabled solutions but also provide a platform where developers can rapidly create and customize newer applications in the same domain. It begins with the description of Salesforce.com, one of the very well-known SaaS cloud applications that delivers a CRM service. This is followed by a description of social computing services and then Google Docs, which are important consumer applications. The Google Docs example produced some additional insights. Though this SaaS application can be considered as a simple portal which enables hosting, sharing, and viewing of documents, the extra features to support interoperability and reliability are interesting.
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