Janos Ver

This plugin will enable you to
<ul>
<li>
Create Reading Groups and associate them with users and private posts and private pages
</li>
<li>
Once these users logged in they will see those private posts and private pages which you granted access to
</li>
<li>
Publish your posts and pages to general public as usual
</li>
</ul>
Your users will not be aware (unless you tell them) of what Reading Groups they are part of (if any).
Translations
<ul>
<li>
Hungarian – Janos Ver (last updated for plugin v1.9)
</li>
<li>
Czech – TomKom (last updated for plugin v1.9)
</li>
</ul>

WP JV Post Reading Groups

Thank you. Your work really saved me a lot of time. Thanks again

Very good

Easily create posts and pages visible only for selected users of your blog

WP Chill

Awaken Solutions Inc.

This plugin allows you to easily mark certain pages with “Permissions” and only users with those permissions will be allowed to see the contents of the page.
<ul>
<li>
Page Permissions: This plugin adds a new Permissions taxonomy to your pages. Administrators can create/assign new permissions from the Edit Page screen (you can also use the Quick Edit link). You can add/edit/delete permissions from the Permissions sub-menu under the Pages menu. Pages with no assigned permissions can be seen by everyone.
</li>
<li>
User Permissions: Administrators can add/remove permissions from a user using the checkboxes on the Edit User screen. The All Users page has a column that shows the permissions assigned to each user.
</li>
<li>
Restriction Message: If a page has permissions assigned, the content will only be visible to users that have one of those same permissions assigned. Otherwise, the content will be replaced by a generic message or a custom message which can be defined in the plugin settings using the standard WordPress editor (including the ability to add media and formatting).
</li>
<li>
Redirect to login: Instead of a restriction message, you can choose to have users get redirected to the login page.
</li>
</ul>

Simple Restrict

Restrict pages based on permissions assigned to pages and granted in user profiles.

WP JV Post Reading Groups vs Simple Restrict