storyday

force user login into wordpress only from one browser at the same time 
the last login action will kick out the already logged user 
this is a security plugin for wordpress,install this plugin to avoid simultaneously login

multi-login-checker

force user login into wordpress only from one browser at the same time

brijeshk89

WP Secure Login adds a security layer and 2 step authentication to your WordPress site by asking a One Time Password in addition to the username and password on the login page. The One Time Password is displayed on your smartphone using Google Authenticator app (available in market place for FREE). The One Time Password is re-generated at regular intervals which can be customized from admin panel. As soon as the new OTP is generated the old ones are marked as invalid.
One Time Password needs to be configured once by every user from Edit Profile page.
Features in WP Secure Login 1.1 include:
<ul>
<li>2 Step Authentication</li>
<li>Unique Secret key for each user</li>
<li>Configure/Re-Configure WP Secure Login</li>
<li>Unique One Time Passwords generated by Google Authenticator App</li>
<li>Supported on iOS/Android/Blackberry smartphones</li>
<li>Completely FREE</li>
<li>Licensed under GNU GPL version 3</li>
<li>Safe & Secure</li>
</ul>

WP Secure Login

WP Secure Login adds a security layer and 2 step authentication to your WordPress site by asking a One Time Password in addition to the username and p …

multi-login-checker vs WP Secure Login