Are these re-implementations?

Or does Amazon offer the source code for these services?

Not meant as a critical question, I don't understand the origins of this repository and really how it can be.

From the readme:

> LocalStack builds on existing best-of-breed mocking/testing tools, most notably kinesalite/dynalite and moto.

Kinesalite and Dynalite are LevelDB-based reimplementations of Kinesis and DynamoDB, and Moto is a mocking library for many AWS services including S3, EC2, etc.

Thanks. Okay then, I guess.

I did read it, but I've never heard of a "mocking tool". This is new ground for me.