- google-authenticator – The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH) (which is unrelated to OAuth). These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. Tutorials: How to set up two-factor authentication for SSH login on Linux
- Stegcloak – Securely assign Digital Authenticity to any written text
- Firebase Authentication – Firebase Authentication aims to make building secure authentication systems easy, while improving the sign-in and onboarding experience for end users. It provides an end-to-end identity solution, supporting email and password accounts, phone auth, and Google, Twitter, Facebook, and GitHub login, and more.plat_iosplat_androidplat_webplat_cppplat_unity
- Autho0 – Auth0 is an easy to implement, adaptable authentication and authorization platform.