AWS Amplify - JavaScript library for app development using cloud services
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Online Compiler & Editor - Online Compiler & Editor is the highly efficient and fast-speed online compiler IDE that can run, execute, and compile the snippet on mobile and tablets by supporting more than forty-five programming languages.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Google Cloud Repositories - GitHub alternative by Google
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.