Azure MySQL Flexible vs Single Server Offerings:

Terraspace: The Terraform Framework

It provides an organized structure, conventions over configurations, keeps your code DRY, and adds convenient tooling. Terraspace makes working with Terraform easier and more fun.
Jets: The Ruby Serverless Framework

Ruby on Jets allows you to create and deploy serverless services with ease, and to seamlessly glue AWS services together with the most beautiful dynamic language: Ruby. It includes everything you need to build an API and deploy it to AWS Lambda. Jets leverages the power of Ruby to make serverless joyful for everyone.
AWS CodeBuild Tool

Cody is a AWS CodeBuild management tool. Cody simplifies creating and managing AWS CodeBuild projects. Comes with a powerful DSL.
Lono: The CloudFormation Framework

Building infrastructure-as-code is challenging. Lono makes it much easier and fun. It includes everything you need to manage and deploy infrastructure-as-code.
Kubes: Kubernetes Deployment Tool

Kubes is a Kubernetes Deployment Tool. It builds the docker image, creates the Kubernetes YAML, and runs kubectl apply. It automates the deployment process and saves you precious finger-typing energy.

Azure MySQL Flexible vs Single Server Offerings: Flexible Basically Provides HA Option