Authenticator_ciacob is a PHP library to register and authenticate users. It can do open or closed registration, via a master password. User roles are supported. Live authentication can be done by changing session unique ID from one request to another. There is support for password recovery or resetting. It has a built-in hack prevention system that logs a user out when an obsolete session ID is used, or if the IP address changes from one request to another, or when a session lifetime times out. A user is automatically locked out on too many failed login attempts. Locks are IP-based and can be reset by the master. Authenticator_ciacob is easy to configure via external XML files. It is protected against SQL injections by a built-in database traffic encoding and decoding mechanism.
oauth-php is a PHP library for OAuth consumers and servers. It has an extensible OAuth store, including a full working implementation of a MySQL store. The library implements methods to: verify incoming requests against the library; to sign outgoing requests, with curl support for actually doing the request; to sign requests with a body; to administrate consumer keys and tokens for multiple users (server and consumer side); and to log incoming and outgoing requests handled by the library (optionally in the database).
dynalogin is a distributed two-factor authentication suite that combines a secure UNIX server and API with an Android soft token. Open standards (HOTP, TOTP, and soon OCRA) are used for one-time passwords. A C library is provided for inclusion in existing software and Web sites. OpenID (using SimpleID) is supported for Web applications and single sign on. PAM is supported for easy UNIX and LDAP integration (SASL, RADIUS, and JAAS in development). It works with Google Authenticator or the dynalogin Android application.