Open source two-factor-authentication projects
Every project in the registry tagged two-factor-authentication, ranked by real GitHub adoption.
One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator
The missing reverse proxy for ssh scp
WebAuthn ruby server library ― Make your Ruby/Rails web server become a conformant WebAuthn Relying Party
Frequently asked questions
How many open source two-factor-authentication projects are there?
This registry tracks 3 projects tagged two-factor-authentication, with 4,402 GitHub stars between them. The most-adopted is otplib at 2,295 stars.
Are these two-factor-authentication projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 1 distinct licence, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which two-factor-authentication project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these two-factor-authentication projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.