Here is a list of free WordPress plugins for running your own email marketing campaigns directly from your website:

1. MailPoet:
– Allows you to create and send newsletters, automated emails, and manage subscribers.
– Seamless integration with WordPress and WooCommerce.

2. Mailchimp for WooCommerce:
– Connects your WooCommerce store to your Mailchimp account to automate marketing.
– Syncs customer data, including purchase history.

3. Newsletter:
– A powerful newsletter and email marketing system for WordPress.
– Includes a drag-and-drop composer, subscription widgets, and more.

4. Email Subscribers & Newsletters:
– A simple yet effective plugin for creating and sending newsletters, collecting leads, and managing subscribers.
– Provides email templates, automated emails, and list segmentation.

5. Sendinblue – Email Marketing, SMTP, and Marketing Automation:
– Integrates with Sendinblue to manage email marketing campaigns, transactional emails, and automation workflows.
– Offers a free plan with up to 300 emails per day.

6. Mailster:
– A fully-featured newsletter plugin with drag-and-drop editor, automated campaigns, and detailed analytics.
– Free version available with essential features.

7. MC4WP: Mailchimp for WordPress:
– Integrates with Mailchimp to create sign-up forms and manage subscribers.
– Easily connects with other plugins like WooCommerce and Contact Form 7.

8. MailChimp Forms by MailMunch:
– Allows you to create Mailchimp forms to grow your email list.
– Offers various form types like pop-ups, embedded forms, and top bars.

These plugins provide a range of features to help you create, send, and manage your email marketing campaigns directly from your WordPress website.