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Instead of asking for both an email and a username on registration, this plugin lets you ask for email only, and uses that as username as well. Since the password is automatically generated and emailed to the user, this allows for sign-up form with a single form field: email.
For users that registered with different username and email address before this plugin was installed, their username and email address will be interchangeable on login.
The plugin offers a shortcode, [NP-registration], to add the registration form to a post or page.
Note: This plugin has not been tested with WP versions older than to 3.1.5. It should work with some older versions, but we can not guarantee it. However, if you are running an older version of WordPress, there are some very compelling arguments why you should consider upgrading. If you need help, there is plenty of free help to be found on WordPress.org, and Next Page, the authors of this plugin, offer a paid WordPress maintenance service.

Login Tweaks by Next Page

Use email as username to allow for single-field signup. Adds shortcode for adding registration form to post.

GetResponse

<h4>GetResponse for WordPress</h4>
GetResponse for WordPress lets you add site visitors to your contact list, update contact information, and add your GetResponse landing pages to your WordPress site as a page. Use it to track site visits and pass ecommerce data to GetResponse. The plugin helps grow your contact list and ensures you have the contact information and ecommerce data to plan successful marketing campaigns.
The plugin features include:
<h3>List-building options</h3>
Encourage people to sign up using all the list-building options and built-in integrations with Contact Form 7, BuddyPress and Ninja Forms:
<ul>
<li>add GetResponse forms anywhere on your site and to your blog posts,</li>
<li>add an opt-in box to comments and registration forms to add site visitors to your list,</li>
<li>add an opt-in box to Contact Form 7, Ninja Forms and BuddyPress forms.</li>
</ul>
Add GetResponse landing pages on your WordPress site to:
<ul>
<li>easily feature new webinar, signup, promotion, download, or sales-focused pages,</li>
<li>use popup, exit popup, and fixed bar forms on the pages to get more signups,</li>
<li>run A/B tests to ensure your page design is optimized for conversions,</li>
<li>easily publish landing pages under your WordPress domain as a subpage,</li>
<li>add contacts without any 3rd party integrations directly after they sign up from one of your landing pages.</li>
</ul>
<h3>WooCommerce – add contacts and collect ecommerce data</h3>
The built-in integration with WooCommerce lets you add customers to your contact list and send ecommerce data to GetResponse. Here’s what you can do with it:
<ul>
<li>grow your list by adding customers at checkout,</li>
<li>export customer list to GetResponse (this option allows you to export custom fields and purchase history),</li>
<li>collect information about customer spending habits, products, purchases made, and shopping carts.</li>
</ul>
<h3>Web Event tracking</h3>
GetResponse for WordPress lets you track visits to your site. Create workflows based on URLs visited. Use advanced search options to identify people who recently visited your site. You can create custom filters and plan your mailings.
Have questions? Head to our <a href="https://www.getresponse.com/help/integrations-and-api#subcat-wordpress-integration" rel="nofollow ugc">Help Center</a> for more information about installing the features in the plugin.

GetResponse for WordPress

Take advantage of your visitors' commentators' and customers' interest. Invite them to subscribe and nurture their engagement.

Login Tweaks by Next Page vs GetResponse for WordPress