Which of these AWS services can be used without incurring additional service charges?

AWS Organizations allows you to centrally manage and consolidate multiple AWS accounts without incurring additional charges for the service itself. You only pay for the AWS resources consumed by the accounts within your organization. Amazon SageMaker is a machine learning service that incurs charges based on usage (e.g., instance hours, storage). AWS Config is a service that enables you to assess, audit, and evaluate the configurations of your AWS resources, and it incurs charges based on the number of configuration items recorded and rule evaluations. Amazon CloudWatch is a monitoring and observability service that incurs charges for metrics, logs, and alarms beyond the free tier.