Leveraging commitments such as AWS Reserved Instances and Savings Plans is a great way to optimize cloud compute costs.
Commitment Manager by Zesty automatically buys and sells commitments according to real-time EC2 usage, achieving a 45% discount with Zero engineering effort.

Zesty Disk™ automatically adjusts storage volumes in real-time based on the application needs, achieving optimal disk utilization, and a dramatic reduction in EBS spend.