Stefano

This add-on plugin for bbPress will allow anonymous users to subscribe to topics and get email notifications when a new reply is posted. The notification email includes an unsubscribe link.
bbPress notifications will keep to go out to registered users, this plugin only extends the thing to anonymous posters as well!
See the project on <a href="https://github.com/TheCrowned/bbPress---Anonymous-Subscriptions" rel="nofollow ugc">GitHub</a>.
Available in English, Italian, German, Norwegian, Ebrew, Serbian.

bbPress – Anonymous Subscriptions

A simple plugin to allow anonymous bbPress users to subscribe to topics and get email notifications when a new reply is posted.

Kleor

Contact Manager allows you to easily insert contact forms (with or without CAPTCHA) into posts, pages and widgets of your website. You can create an unlimited number of contact forms and customize them completely. If you wish, Contact Manager can also record the messages in your database, and allows you to automatically offer a gift to people who send you a message.
<ul>
<li><a href="https://www.kleor.com/demo/wp-login.php?login=tester&plugin=contact-manager" rel="nofollow ugc">Demo interface</a></li>
<li><a href="https://www.kleor.com/contact-manager/" rel="nofollow ugc">Documentation</a></li>
</ul>
Here’s <a href="https://www.kleor.com/contact/" rel="nofollow ugc">a sample form that you can add to your website</a> with Contact Manager. See <a href="https://www.kleor.com/your-opinion/" rel="nofollow ugc">another sample</a>.
<h4>Quick Start</h4>
Here’s how to set up a form in less than 20 seconds:
<ol>
<li>Insert the <code>[contact-form id=1]</code> code into your posts/pages/widgets to display this form.</li>
</ol>
That’s all!
The “Back Office” page of Contact Manager allows you to customize your interface. With this page, you will can display the items that are useful for you and remove the others. In short, you will get an interface that fits precisely to your needs. We advise you to quickly browse through the admin pages of Contact Manager in order to have a global vision, and then take the time to properly configure your options.
<h4>Maximum performances for a better SEO</h4>

Some WordPress plugins slow down the websites that use them. Contact Manager has been developed with a lot of attention to its performances so that it doesn’t slow down your website and it remains fast.
Moreover, contrary to a common practice among WordPress plugins/themes, Contact Manager doesn’t add any CSS or JavaScript files to the pages of your website, in order to not increase their weights or the number of HTTP requests. So even after installing this plugin, your website’s pages will still load as quickly as before, and their Google PageSpeed scores will not drop.
<h3>Plugins from the same author</h3>
<ul>
<li><a href="https://www.kleor.com/commerce-manager/en/" rel="nofollow ugc">Commerce Manager, to sell your products</a></li>
<li><a href="https://www.kleor.com/affiliation-manager/en/" rel="nofollow ugc">Affiliation Manager, to create your affiliate program</a></li>
<li><a href="https://www.kleor.com/membership-manager/en/" rel="nofollow ugc">Membership Manager, to create your members areas</a></li>
<li><a href="https://www.kleor.com/optin-manager/en/" rel="nofollow ugc">Optin Manager, to build your prospects lists</a></li>
<li><a href="https://www.kleor.com/easy-timer/en/" rel="nofollow ugc">Easy Timer, to display count down/up timers</a></li>
<li><a href="https://www.kleor.com/content-switcher/en/" rel="nofollow ugc">Content Switcher, to display random or variable contents</a></li>
<li><a href="https://www.kleor.com/device-detect/en/" rel="nofollow ugc">Device Detect, to detect smartphones and tablets</a></li>
</ul>

Contact Manager

Some WordPress plugins slow down the websites that use them. I created Contact Manager with a lot of attention to its performances so that it doesn't slow down your website and it remains fast.

Moreover, contrary to a common practice among WordPress plugins/themes, Contact Manager doesn't add any CSS or JavaScript files to the pages of your website, in order to not increase their weights or the number of HTTP requests. So even after installing this plugin, your website's pages will still load as quickly as before, and their Google PageSpeed scores will not drop.

Maximum performances for a better SEO

Allows you to create and manage your contact forms and messages.

bbPress – Anonymous Subscriptions vs Contact Manager