This post will illustrate how to build a simple Google App Engine (GAE) Java application that authenticates against Google as well as leverages Google’s OAuth for authorizing access to Google’s API services such as Google Docs. In addition, building on some of the examples already provided by Google, it will also illustrate how to persist data using the App Engine Datastore and Objectify.
The biggest names in e-mail have teamed up to create a new system for authenticating e-mail senders, which would help prevent fraudulent spam and phishing messages.
Google, Microsoft, Yahoo, PayPal Go After Phishers With New E-Mail Authentication Effort
We developed a system to quick login with Google account using OpenID authentication. This script helps you to avoid registration forms and email verification system, It’s is very quick, useful and simple to integrate.
PHP script for Login with Google Account