WordPress known well by not one, but hundreds of thousands people worldwide who are widely using the platform for creating a blog or website. It is very normal that there is a point in time that you will encounter hackers who are attempting to abuzz your WP site. If you manage a WordPress site, or even several sites for clients, beefing up the overall security of a site is a no-brainer.

If you are not familiar with best free WordPress authentication plugins, you are absolutely in the right place. In this round-up, we’ll look at some of the top authentication free plugins available for WordPress. You may also take a look at our past collections for inspiration: Free Sliding Widgets for WordPress, Free WordPress Drag and Drop Themes, Pricing Table Plugins for WordPress and Fixed Navigation Menus in Web Design.

1. Users Ultra

Users Ultra is the ideal tool for creating advanced user communities in few minute. Building a talents community, model agency websites, social communities and any kind of user websites is really fast. It can be intregrated in any WordPress Theme.

Users Ultra

Users Ultra

2. Gigya – Social Infrastructure

Gigya makes websites social by integrating online businesses with the most popular social networks and implementing powerful social plugins into a single, comprehensive solution.

Gigya - Social Infrastructure

Gigya – Social Infrastructure

3. Login Widget With Shortcode

This is a simple login form in the widget. This will allow users to login to the site from frontend. This is a simple login form in the widget. Just install the plugin and add the login widget in the sidebar. Add css as you prefer because the form structure is really very simple.

Login Widget With Shortcode

Login Widget With Shortcode

4. CAS Maestro

CAS Maestro allows you to configure your centralized authentication service, CAS, for an integrated log in with WordPress. LDAP is optional. If the user data is valid, they are redirected back to WordPress.

CAS Maestro

CAS Maestro

5. InfiniteWP Client

InfiniteWP allows users to manage unlimited number of WordPress sites from their own server. Self-hosted system: Resides on your own server and totally under your control. One-click updates for WordPress, plugins and themes across all your sites.

InfiniteWP Client

InfiniteWP Client

6. Google Apps Login

Google Apps Login allows existing WordPress user accounts to login to your website using Google to securely authenticate their account. This means that if they are already logged into Gmail for example.

Google Apps Login

Google Apps Login

7. iRemoteWP Multiple WordPress Control

The iRemoteWP WordPress plugin is a amazing multiple WordPress sites management service from one location and works with iRemoteWP.com. Remotely manage all your WordPress sites from one, easy dashboard.

iRemoteWP Multiple WordPress Control

iRemoteWP Multiple WordPress Control

8. ManageWP Worker

ManageWP is a revolutionary service that automates the management of multiple WordPress websites. ManageWP Worker Plugin allows your site to communicate with the service.

ManageWP Worker

ManageWP Worker

9. WP-Members

WP-Members is a plugin to make your WordPress blog a membership driven site. Perfect for newsletters, premium content sites, and more! The plugin restricts selected WordPress content to be viewable by registered site members.

WP-Members

WP-Members

10. WP Password Policy Manager

Configure strong WordPress password policies for users to improve the security of your WordPress by ensuring users are not using weak passwords.

WP Password Policy Manager

WP Password Policy Manager

11. WP Graphic Captcha Protection

WP Graphic Captcha Protection is easy to setup and use. No extra hardware or complicated software to install. It protects your website agains bots and spam software. Adds extra security for login page, user registration page, lost password page, add comment page.

WP Graphic Captcha Protection

WP Graphic Captcha Protection

12. Duo Two-Factor Authentication

Duo Security provides two-factor authentication as a service to protect against account takeover and data theft. Using the Duo plugin you can easily add Duo two-factor authentication to your WordPress website in just a few minutes!

Duo Two-Factor Authentication

Duo Two-Factor Authentication

13. SiteWarranty Verified & Trust Seals

The SiteWarranty trust seal/site seal increases sales by visually displaying proof that your company address, phone number and order processing has been authenticated by a third party company and is up to date.

SiteWarranty Verified & Trust Seals

SiteWarranty Verified & Trust Seals

14. WP Admin Graphic Password

WP Admin Graphic Password is easy to setup and use. No extra hardware or complicated software to install. If your computer infected with the viruses or when you are using the public places to access to your website, remember your password can be stolen.

WP Admin Graphic Password

WP Admin Graphic Password

15. Toopher Two-Factor Security

Toopher’s Location-based Two-Factor Authentication protects your website from unauthorized logins. Passwords that are easy to remember are insecure almost by definition, and passwords that are hard to remember end up getting written down or forgotten.

Toopher Two-Factor Security

Toopher Two-Factor Security

16. CMS Commander Client

CMS Commander allows you to manage multiple WordPress weblogs from a single powerful dashboard. Do everything you can normally do in your WP-admin, just for all your weblogs simultaneously: Bulk plugin installation, bulk posting, install updates on all sites, create backups, clone blogs and much more.

CMS Commander Client

CMS Commander Client

17. Authy Two Factor Authentication

Authy helps you proctect your WordPress site from hackers using simple two-factor authentication.

Authy Two Factor Authentication

Authy Two Factor Authentication

18. Two-Factor Authentication

Controls access to your WordPress administration panel by sending a code to your mobile phone when you try and login. Configurable for different user groups with a variety of options.

Two-Factor Authentication

Two-Factor Authentication

19. BulletProof Security

WordPress Website Security Protection: BulletProof Security protects your WordPress website against XSS, RFI, CRLF, CSRF, Base64, Code Injection and SQL Injection… hacking attempts.

BulletProof Security

BulletProof Security

20. Login Security

Login Security is a plugin that tries to protect you against such attacks. Every successful or failed login attempts are recorded. You will probably discover that a lot of brute force attacks are performed on your website.

Login Security

Login Security