OAuth

= open protocol to allow secure API authentication

URL = http://oauth.net/

Description

From the Wikipedia:

"OAuth is an open protocol, initiated by Blaine Cook and Chris Messina, to allow secure API authentication in a simple and standard method from desktop and web applications. For consumer developers, OAuth is a method to publish and interact with protected data. For Service Provider developers, OAuth gives users access to their data while protecting their account credentials." (http://en.wikipedia.org/wiki/OAuth)