Plugin Tag፥ login limit
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Loggedin – Limit Active Logins
Light weight plugin to limit number of active logins from an account. Set maximum number of concurrent logins a user can have from multiple places.
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FluentAuth – The Ultimate Authorization & Security Plugin for WordPress
Enhance the Security and User Experience of Your Site with Login/Signup Security, Two-Factor Email Authentication, Social Logins and more…
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WP Login Attempts
WP login attempts is a very lightweight plugin that lets you customize your WordPress admin login page easily and safely.