AWS GoFormation is a GO library for the generation and reading of CloudFormation. So it`s a kind of CDK predecessor. Other than the CDK, all GO structures are directly generated from the CloudFormation schemata. So its very fast, but not as powerful as the CDK.

A UseCase could be if you want to generate special CloudFormation templates because you are not allowed to use CDK or the Resources are not yet supported by CDK.

You could also deliver an application in all GO supported operation systems as a single file, which deploys CloudFormation.