The AWS Serverless Application Model (SAM) implementation is now available under the Apache 2.0 license. AWS SAM extends AWS CloudFormation to provide a simplified way of defining the resources needed by your serverless application. The SAM implementation is the code that translates SAM templates into AWS CloudFormation stacks. Previously, you could submit feature requests to the SAM specification and AWS would need to make corresponding updates to the SAM implementation. Now, you can contribute new features and enhancements to all of SAM. You can fork the SAM repository and propose changes to the implementation by creating a pull request.