Gregor Capuder

ProteusThemes

Primoz Cigler

Prelc

This plugin registers a custom WordPress widget called Mailchimp by ProteusThemes. This widget will allow you to connect to your Mailchimp account with your API key and you will be able to select the list you want your visitors to subscribe to.
This widget can be used for all sorts of things, like: newsletter, lead capture, email sequence, and much more!
The Widget will output an email input field and a submit button, that’s all you need to capture your visitor’s email address. Main idea behind this plugin is that’s easy and simple to use.
Do you want to contribute?
Please refer to the official <a href="https://github.com/proteusthemes/mailchimp-widget" rel="nofollow ugc">GitHub repository</a> of this plugin.

Mailchimp Widget by ProteusThemes

There are tons of plugins with similar functionality, most of them will clutter your wp-admin with banners and upgrade notices or be very hard to use and configure. Most probably both.

This is a perfect example how the plugins should look like. Easy to use and without all the unnecessary clutter and gazillion of options. Great work!

Finally a plugin which does one thing and does it well

Capture your visitor's email address and subscribe them to your newsletter campaign with this simple Mailchimp widget plugin!

Mahfuzar Rahman

The MailChimp plugin allows you to quickly and easily add a signup form for your MailChimp list as a widget on your WordPress 2.8 or higher site.
Not sure what <a href="http://www.mailchimp.com/features/full_list/" rel="nofollow ugc">MailChimp</a> is or if it will be helpful? Signup up for a <a href="http://www.mailchimp.com/signup/" rel="nofollow ugc">FREE Trial Account</a> and see for yourself!
After Installation, the setup page will guide you through entering API information, selecting your List and then add the Widget to your site. The time from starting installation to have the form on your site should be less than 5 minutes – absolutely everything can be done via the WordPress Setting GUI – no file editing at all!
<h3>Developer Mode</h3>
You can enable “Devleoper Mode” by adding the following line to your <code>wp-config.php</code> file just above the “That’s all, stope editing!” line.
<pre><code>define('MAILCHIMP_DEV_MODE', true);
</code></pre>
This will enable the MailChimp List Subscribe plugin to operate without the need to connect an external MailChimp Account, and will provide a 
subscription form widget that will not actually submit anywhere.
This will allow you to style and configure the widget in non-production environments that are not publicly accessible.
For more Developer Mode customization options see the following article:
http://connect.mailchimp.com/how-to/how-to-article-configuring-developer-mode-for-the-list-subscribe-wordpress-plugin

Easy Mailchimp Optin Form

The MailChimp plugin allows you to quickly and easily add a signup form for your MailChimp list as a widget on your WordPress 2.8 or higher site.

Mailchimp Widget by ProteusThemes vs Easy Mailchimp Optin Form