This Mod of Search Engine Spiders can add to your site

Prohibit individual users from sending private messages or using the private messaging system.

Provides Additional Database Methods

Adds a task to delete old backup files

Simple MyBB 1.8 plugin to add a promotion option to push inactive forum user into another user group.

Adds four additional forum options for control over avatar, signature, quick reply display and post reputation in forums.

If you create a user in the Admin CP, this will email them their account details so they can login.

Checks the users ip address on login and only allows logging into an admin account from an ip from the admin ips whitelist.

Lightweight AJAX chat, modified by Rainbow Fresh.

Sort usergroups by priority, highest priority group will be the primary group

Allows you to create custom variables

This plugin allow upload plugin from Admin CP

Purges soft deleted posts and threads automatically

The plugin adds the ability to display the status of users on TS3 and displays the list of users (screenshots).

Restricts moderator and/or administrator account access to specific IP addresses.

Logs all no permission errors. They can be viewed in Admin CP under Tools & Maintenance

Require users to certify their age via a form check stored as a cookie; similar to Jcink's age verification process.

Force new members to introduce themselves

adds a new section in the AdminCP that checks for additional files and folders in the board directory.

Adds a task to your board that deletes thread/forum subscriptions from inactive threads/forums.