Amazon Simple Workflow Service (SWF) is a web service that makes it easy to coordinate work
across distributed application components. SWF enables applications for a range of use
cases, including media processing, web application back-ends, business process workflows,
and analytics pipelines, to be designed as a coordination of tasks
Amazon Security Token Service (STS) is used for requesting temporary credentials
Amazon Simple Queue Service (SQS) is a message queue used for decoupling application
components
Amazon Simple Notification Service (SNS) is a web service that makes it easy to set up,
operate, and send notifications from the cloud
SNS supports notifications over multiple transports including HTTP/HTTPS, Email/Email-JSON,
SQS and SMS