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>
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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 …

Grork

This plugin will allow you to connect your <code>WordPress blog</code> with your <code>MyBB forum</code>.
When someone registers in MyBB, his information like the username will be stored in WordPress, so when he logins in the blog, he will be automatically logged in in the forum.
The system is tested with MyBB v1.8.*
Download the MyBB-side: https://www.dropbox.com/s/k2llnw3pz1keaz8/MyPress-MyBB.zip?dl=0

MyPress

Connect WordPress with MyBB. Everytime a user registers in your MyBB Forum, he will also be registered in WordPress.

myBB Integration by TheCartPress vs MyPress