2FAS
GoodSimple open source authenticator.
Our pick
Yes. Ente Auth is a legitimate tool and IsLegit's pick for: Turn on two-step login. Open source authenticator with encrypted backup.
Open Ente AuthWorks on: Android, iPhone, Windows, Mac, Linux, Web · Free
Simple open source authenticator.
Basic authenticator, syncs to your Google account.
Authenticator with Microsoft account backup.