In addition to Sparta, there are some related projects that are often useful for serverless-based applications. These packages do not require Sparta integration.
go-cloudcondensor is a standalone utility that produces CloudFormation templates via functional composition.
go-cloudformation provides a Go object model for the official CloudFormation JSON Schema.
Use KMS to encrypt values into Go types that can be safely committed to source control.
An in memory, expiring cache for AWS Systems Manager. SSM is a suggested option for managing Lambda secrets.
There are also many Sparta example repos that demonstrate core concepts.