jdavis/twofactorauth — pull request #907 by dsoegijono (2014-12-12 02:45:49+00:00)
Title: Add Mitro to Identity

They're [open source](https://github.com/mitro-co/mitro), in case anyone is interested.

They do require users to verify email when logging in through a new device; does this count as email tfa?