SourceTree - Mac and Windows client for Mercurial and Git.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
TortoiseGit - TortoiseGit is an easy to use client for the Git distributed revision control system.
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.