AWS Cost Explorer – enables you to visualize your usage patterns over time and to identify your
underlying cost drivers.
AWS Simple Monthly calculator – shows you how much you would pay in AWS if you move your
resources.
AWS CloudTrail provides a record of API activity in your account. I.e. who did what to which
resource.
AWS Consolidated Billing is a feature of AWS Organizations that allows you to consolidate billing
across multiple linked accounts and benefit from volume pricing discounts.