Nord

This is a simple plugin that allows visitors to enter their name and email address on your website, the visitors details are then added to the subscribers list which is available to view and modify in the WordPress admin area.
This plugin can be used not only for Mailing List subscriptions but can be used generally for collecting email address and/or peoples names that are visiting your website.
The name/email form can not only be customised but can also be displayed on any WordPress page by using either the ‘Subscribe Widget’

Nord Sub News

Simple customizable plugin that displays a name/email form where visitors can submit their information, manageable in the WordPress admin.

Blossom Themes

BlossomThemes Email Newsletter allows you to add email subscription form on your website. The plugin works best with BlossomThemes’ themes.
Adding Subscription Form has never been this easy. Choose an email platform, enter your API key, choose an email list, and start getting new subscribers to your website.
The plugin supports Sendinblue, MailChimp, MailerLite, ConvertKit, GetResponse, ActiveCampaign, AWeber.
You can create any number of Newsletter forms and display them using a shortcode, popup and/or a widget.
Once installed, the plugin page will appear on the Admin dashboard.
<h4>Key Features and Highlights</h4>
<ul>
<li>Unlimited newsletters and subscribers with statistics</li>
<li>Supports Sendinblue, MailChimp, MailerLite, ConvertKit, GetResponse, ActiveCampaign and AWeber</li>
<li>Display newsletter forms using a shortcode, popup and/or a widget</li>
<li>Lists/Campaigns updates via AJAX</li>
<li>Multi-list or single-list targeting in individual newsletter</li>
<li>Form submission via AJAX, allowing a seamless user experience without page refreshes</li>
<li>Background Image, Background Color and Font Color support</li>
</ul>

BlossomThemes Email Newsletter

Easily add email subscription form to your website using shortcode and widget.

Nord Sub News vs BlossomThemes Email Newsletter