Nextend Google Connect

The plugin guides the webmaster through the process of adding a Google authentication button to his login and registration page.

It also allows existing users to link their profiles with a Google account.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

The plugin is also available with support for other social networks, including:
Twitter
Facebook

Features:

• Very well documented
• General settings page added in the WP backend
• Easy to style
• Button creator app

What is new in this release:

• Security fix for redirects.

What is new in version 1.4.55:

• Now the plugin use cookies instead of PHP session. Maybe this fixes the problems.
• Now the plugin use wp transient for the admin messages

What is new in version 1.4.52:

• Avatar fix.

What is new in version 1.4.36:

• PHP notice fixes.

What is new in version 1.4.25:

• wp_login do_action fix.

What is new in version 1.4.21:

• Bugfix for WordPress 3.5RC1.

What is new in version 1.4.12:

• Fixed session check.

Requirements:

• WordPress 3 or higher