DCoda

This plugin is only supported on PHP 5.2 or greater.
 
MembersBlog easily allows you to lock down your blog to members only. 
Unauthenticated visitors who try to view the blog content will be forced to the login page , or presented with an browser login prompt if they try to view the feed.
When the blog and feed are locked down to subscribe to a feed using a feed reader a username and password must be supplied in the url:
<pre><code>http://{username}:{password}@{feed url}
</code></pre>

If you are having trouble and cannot find the answers in the <a href="http://membersblog.dcoda.co.uk/help/faq/" rel="nofollow ugc">FAQ</a> you can post your support questions to the <a href="https://wordpress.org/tags/members-blog" rel="ugc">WordPress Support Forum</a>
If you find MembersBlog useful please rate it at <a href="https://wordpress.org/extend/plugins/members-blog/" rel="ugc">wordpress.org</a> and please consider making a <a href="http://membersblog.dcoda.co.uk/donate/" rel="nofollow ugc">donation</a> to help us set aside more hours to maintain MembersBlog
MembersBlog is written by <a href='http://dcoda.co.uk' rel="nofollow ugc">dcoda</a>
You can check out our other plugins <a href="https://profiles.wordpress.org/users/dcoda/" rel="nofollow ugc">here</a>
If you require a custom plugin you can contact us <a href="http://dcoda.co.uk/contact/" rel="nofollow ugc">here</a> and maybe we could write it for you.
<h3>Copyright</h3>
(c) Copyright DCoda Limited, 2007 -, All Rights Reserved.
This code is released under the GPL license version 2, available here:
<a href="http://www.gnu.org/licenses/gpl.txt" rel="nofollow ugc">http://www.gnu.org/licenses/gpl.txt</a>
There are so many possibly configurations of installation the plugin can be installed on we limit testing to a PHP 5.2+ Linux platform running the latest version of WordPress at the time of release but it is released WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

MembersBlog

Lock down all your posts and pages so only members can access them

Joseph G.

<h4>Quick Overview</h4>
Subway is a small plugin for WordPress that allows you hide the content of your website to non-logged in visitors and only displays them to logged in users.
<h4>Description</h4>
This plugin redirects the users to the provided login page with a login form that allows them to type their username/email and password combination.
The plugin has settings inside the Administration Panel (‘Settings’ > ‘Subway’) that allows you to configure where you want the user to be taken after he/she has successfully logged in, this can be a page, a custom URL, or just the default behaviour. You can also make individual posts/page public or ‘members only’
If you would like to contribute, report an issue or have any suggestions, visit the <a href="https://github.com/codehaiku/subway-2.0" title="Subway Github" rel="nofollow ugc">Github Repository of Subway</a>.
<h4>Caveats</h4>
Subway is only built for WordPress website owners to redirect non-logged in users to a custom login form. This plugin is not a replacement for Membership websites where a complex set of configurations are allowed. There are no payments model, subscriptions.
Subway is good for Private Intranet Websites where authentication is required.

Subway – Private Site Option

I will rate this 5 star of course :)

Saves time on hiding specific user contents! Great plugin! 

Real Time Saver Plugin!

This plugin is very easy to use and handles its job efficiently.

Great and easy to use plugin

Hide the content of your website to non-logged in visitors and only displays them to logged in users.

MembersBlog vs Subway – Private Site Option