Aegis Authenticator is described as 'Free, secure and open source app to manage your 2-step verification tokens for your online services' and is a very popular Authenticator in the security & privacy category. There are more than 50 alternatives to Aegis Authenticator for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Mac apps. The best Aegis Authenticator alternative is Bitwarden, which is both free and Open Source. Other great apps like Aegis Authenticator are Ente Auth, Proton Authenticator, Bitwarden Authenticator and Authy.