There are many cloud vendors, for example, Salesforce.com, Microsoft Azure, Google App Engine (GAE), and Amazon Elastic Compute Cloud (EC2). Salesforce uses a Java-like language called Apex. The GAE uses Java, Python, PHP, and Go. Microsoft Azure uses .NET but also supports SDKs for Java, Python, PHP, and NodeJS. Amazon uses Java, Python, PHP, Ruby, and .NET. NServiceBus supports both the Microsoft Azure Cloud and the Amazon Cloud. The cloud solutions have many templates that are considered to have an out-of-box (OOB) functionality to build the cloud solution. There are also extra modules that can be installed; many are free, and some require a subscription, such as Salesforce's AppExchange, https://appexchange.salesforce.com. The supporting engines and programming languages are used to extend none of the OOB functionalities. These are additional modules or applications, for example, which connect additional Salesforce features into Android or use Google mail.

While many cloud...