Use this plugin to create content upgrades, which require your readers to subscribe to your email list to get access to the bonus materials.

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Subscribe to Unlock Lite – Opt In Content Locker Plugin for WordPress

Lock your content using our Subscription Form and collect email address and grow your subscribers organically. 5 pre designed template, 2 lock modes,  …

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Adds ability to password lock each category the same way as Wordpress gives you ability to lock each post.

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AdWork Media EZ Content Locker

Easily integrate your AdWork Media Content Lockers & Link Lockers into your WordPress site.

ichurakov

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The plugin allows to lock part of post/page. User must share it on Twitter to view the content.

wphobby

Pretty Opt In Lite – Content Locker for Lead Generation

Pretty Opt-In - Content Locker for Lead Generation

Adam Solymosi

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Secure access to your content (Pages, Posts, or Custom Post Types) with ContentLock's email-based two-step verification!

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Honey Coinhive Locker

Honey Coinhive Locker lets you lock your content on posts, pages, and in theme files.

timsoulo

Content Upgrades plugin will help you to create “content specific bonuses” in your articles, that people have to opt in for.
How does it work?
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The plugin gives you a shortcode that you can use to create a basic text link anywhere in the text of your article.
</li>
<li>
Once your visitors click that text link, a popup will appear, asking them to leave their email address.
</li>
<li>
Once they submit their email address, they will get redirected to the page of your choice.
</li>
</ol>
Get the PRO version at: <a href="http://contentupgradespro.com/" rel="nofollow ugc">http://contentupgradespro.com/</a> 
– unlimited number of “content upgrades“; 
– 5 new design templates of popups; 
– option to turn off Double Optin; 
– automatic bonus delivery by email.

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