Extend your registration form with the user profile fields
Add Mailchimp signup process to WordPress registration form
This plugin provides you with a new Widget that inserts the Registration Form in your sidebar (or wherever a widget-area is defined in your theme).
Sabre is an acronym for Simple Anti Bot Registration Engine.
It's a set of counter measures against spam registration on your blog.
Provide one click single sign-on login and automatic registration support for your user's Facebook account. All processing is done on your site.
Integrates HappyCaptcha anti-spam methods with WordPress including comment, registration, and spam protection.
How to make your audience read more and Protect your blog form spam?. By displaying extracts from blog posts or simple messages in a CAPTCHA alternati
Provides a replacement for login and register and lost password and provides feature for password expiration and optional invitation codes.
Set an alternate registration URL for a subset of users who need a different role on registration.
Automatically changes your WordPress site content links for unregistered users by dynamically changing the link target.
Customizable jQuery accordion for WordPress which gathers Facebook social plugins together .
Let you modify the registration link of your WordPress website.
Automatically send friend/group invites and a welcome message to new users, and redirect them to a custom page. Also provides email customisation opti
Add Google+ Direct Connect Badge & allow your WordPress/BuddyPress users to register or login via their Google+ account & import their stream
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