tcpteam

This plugin is used to register myBB forum user whenever user registered in wordpress. It will also auto login to mybb after user login/register in wordpress. 
It will convenient the user to avoid them to register/login twice in wordpress and mybb.
KEY FEATURES
<ul>
<li>[FREE] Auto register user in myBB when user registered in wordpress.</li>
<li>[FREE] Sync first 20 users from wordpress to myBB.</li>
<li>[PREMIUM] Auto sync all users from wordpress to myBB.</li>
<li>[PREMIUM] Sync 100 users (include sending email to user) per hour. Cron until all users are added to myBB.</li>
</ul>
<h4>Plugin doesn’t fit your requirement?</h4>
Find out more plugins in <a href="https://www.thecartpress.com/" rel="nofollow ugc">TheCartPress</a> or
We have added a welcome page to display all plugins from <a href="https://www.thecartpress.com/" rel="nofollow ugc">TheCartPress</a> inside the plugin menu. You can easily preview and choose the plugin that might fit your requirement inside the admin page. All plugins information displayed inside the menu are getting from TheCartPress server.

myBB Integration by TheCartPress

This plugin is used to register myBB forum user whenever user registered in wordpress. It will also auto login to mybb after user login/register in wo …

iampsp.com

<ul>
<li>After Login user in WordPress System User Add to Mybb System automatically</li>
</ul>
This is simple plugin. 
If you need a plugin or custom theme, I am at your service through the following communication methods : (non-free) 
Telegram : @MostafaShiraali 
Discord : MostafaShiraali#7754

mybbSync

This Plugin Sync Wordpress User With Mybb.

myBB Integration by TheCartPress vs mybbSync