Joshua Parker

Integrate your <a href="https://codecanyon.net/item/tinycampaign/4755189" rel="nofollow ugc">tinyCampaign</a> mailing list and your WordPress powered site with this mailing list subscription form widget. Just enter the list code and the base url of your mailing list, and users will be subscribed to that list 
when they submit the form.
About tinyCampaign 
tinyCampaign is a simple mailing list system that allows you to send out unlimited number of campaigns to your mailing list. tinyCampaign is powered by the Liten Framework and Bootstrap. Below are just a few of tinyCampaign’s features:
<ul>
<li>Unlimited subscribers and mailing lists.</li>
<li>Send personalized and customized emails</li>
<li>Email speed throttling</li>
<li>Custom list settings</li>
<li>Custom success and error url’s</li>
<li>Automatic bounce handling</li>
<li>Regular and ajax subscriber forms to embed</li>
<li>Per campaign custom sender settings</li>
<li>Send campaigns now or later</li>
<li>Send to multiple lists at once</li>
<li>Html editor optimized for newsletter design.</li>
<li>Campaign personalization (body, subject, hyperlinks, etc.)</li>
<li>Easily upload images</li>
<li>Send html, text, or both</li>
<li>Templates manager</li>
<li>View archived campaigns via a web browser</li>
<li>Queue multiple campaigns</li>
<li>Preview campaigns</li>
<li>Send test campaign before queuing</li>
<li>Use multiple SMTP servers</li>
<li>Per user SMTP server(s)</li>
<li>Multiple user accounts</li>
<li>Per user statistics and reports</li>
<li>Per user email templates</li>
<li>Pause, resume, edit a campaign</li>
<li>Clicks/Views email campaign reports</li>
<li>Charts exportable to pdf/png</li>
<li>Email open reporting</li>
<li>Link click tracking</li>
<li>Distribution reports</li>
<li><a href="https://codecanyon.7mediaws.org/knowledge-base/track-campaign-with-google-analytics/" rel="nofollow ugc">Campaign Tracking with Google Analytics</a></li>
<li>Backend email queue</li>
<li>and much more . . .</li>
</ul>
<h3>tinyCampaign Demo</h3>
Click <a href="https://www.tcdemo.us/" rel="nofollow ugc">here</a> to check out the new and improved tinyCampaign.

WP tinyCampaign Widget

A sidebar widget which adds a newsletter subscription form to the sidebar of a WordPress site.

Lew Ayotte

The Pigeon Pack plugin is completely free! This plugin aims to solve one problem, putting the power of email marketing, newsletters, and campaigns in the hands of YOU. Now you do not need to pay for a third party like MailChimp or Constant Contact to reach out to your customers. You have full control and power over your own lists and you can bring them anywhere at any time. The Pigeon Pack plugin is GPL and free to use on any WordPress website.
Features of this plugin include:
<ul>
<li>Single Email Campaigns</li>
<li>WordPress Post Campaigns (single or digest)</li>
<li>Email a specific role or create a list</li>
<li>Easy to use shortcodes and widgets for users to sign up for your emails from your website</li>
<li>Create custom fields for your lists</li>
<li>Double Opt-in available for lists</li>
<li>Easily extendable with filters and action hooks</li>
</ul>
You can follow the development of this plugin at <a href="https://github.com/PigeonPack/PigeonPack" rel="nofollow ugc">GitHub</a>!
Premium Pigeon Pack Add-ons (COMING SOON):
<ul>
<li>Analytics – Learn more about what your subscribers are doing!</li>
<li>Autoresponders (Events) – Send a series of messages to new subscribers.</li>
<li>RSS Campaigns – Import the RSS feed from another site to send to your subscribers.</li>
<li>Import Scripts – Import subscribers from other lists using CSV, MailChimp, Salesforce, Highrise, Constant Contact and more!</li>
<li>Bounce Detector – Use the power of the Pigeon Pack servers to detect when a subscriber’s email is bounced to help reduce the chances of your server being flagged as SPAM.</li>
<li>Responsive Email Template – No more plain-jane emails!</li>
<li>Notifications – Receive notifications whenever someone subscribers or unsubscribers from your list.</li>
<li>Amazon SES – Built-in functionality to work directly with the Amazon Simple Email Server service.</li>
</ul>
Please visit the Pigeon Pack website for access to <a href="http://pigeonpack.com/" rel="nofollow ugc">support and premium membership add-ons</a>!
<h3>License</h3>
Pigeon Pack 
Copyright (C) 2013 leenk.me, LLC.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Pigeon Pack

Free and easy email marketing, newsletters, and campaigns; built into your WordPress dashboard!

WP tinyCampaign Widget vs Pigeon Pack