ORCHA

AWS Lambda Orchestrator. Allows you to give a JSON workflow file written in the Amazon States Language, and execute lambda functions based on your workflow. You can open your workflow in the UI to see a tree diagram of your workflow, run the workflow based on the inputs you specify, and see the diagram update in real-time as your workflow runs on AWS. Executing your workflow requires that you have already created those lambda functions in AWS and have access to them.

Orcha is an open-source alternative to AWS Step-functions.