Prashant Baldha

Frontend HTTP Authentication Protection provides simple HTTP authentication layer to your fronend site. There is often need to prevent normal visitors and search engine from navigating front website, when website is in development environment before release website in production environment. This plugin serves this need very well by adding HTTP authentication layer to frontend site. This WordPress Plugin uses HTTP Basic Authentication. This plugin is fully configurable from admin panel.
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Features: 
1.Enable Disable Frontend HTTP Authentication 
2.Set Custom Username and Password 
3.Set Login Message which will display in login dialog prompt 
4.Set error content by WYSWYG editor

Frontend HTTP Auth Protection

Frontend HTTP Authentication Protection makes private front part of your website. When web developer like to give demo of website to end client before …

KIMoFy

The HTTP Authentication plugin allows you to use existing means of authenticating people to WordPress. This includes Apache’s basic HTTP authentication module, which most servers use.
This plugin works the same way web servers would handle password protection, but in this case, WordPress handles everything.
Ordered list:
<ol>
<li>Password protect a website currently in development.</li>
<li>Secure all admin pages.</li>
<li>Deny access to unauthorized visitors.</li>
</ol>

HTTP Authentication By KIMoFy

Does it's job

HTTP Authentication lets you make a site without letting anyone view it without valid credentials. This can protect the full site or only admin pages.

Frontend HTTP Auth Protection vs HTTP Authentication By KIMoFy