Jared Atchison

This plugin gives you the ability to disable specific user accounts via a profile setting.
Once installed and activated, a checkbox appears on the user profile settings (only for admins). When checked, the users account will be disabled and they will be unable to login with the account. If they try to login, they are instantly logged out and redirected to the login page with a message that notifies them their account is disabled.
This can be useful in a few situations.
<ul>
<li>You are working on a site for a client who has an account, but do not want him to login and/or make changes during development.</li>
<li>You have a client who has an unpaid invoice.</li>
</ul>
<a href="https://github.com/jaredatch/Disable-Users/" rel="nofollow ugc">This plugin is on GitHub!</a> Pull requests are welcome. If possible please report issues through Github.

Disable Users

This plugin gives you the ability to disable specific user accounts via a profile setting.

Eric Binnion

cranewest

Allows admins to deactivate a user as opposed to deleting a user. Works with web and XML-RPC based authentication.
Once installed and activated, a checkbox appears on the user profile settings page. When checked, the user will not be able to login with the account. If they attempt to login, <code>This user has been deactivated. Please contact the administrator.</code> will be displayed in the login error box.

Deactivate WordPress Users

Allows admins to deactivate a user as opposed to deleting a user. Works with web and XML-RPC based authentication.

Disable Users vs Deactivate WordPress Users