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.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
andOTP - andOTP is a two-factor authentication App for Android 4.4+
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.