This plugin allows passwords for password-protected pages/posts to be passed directly through the URL.
Plugin Tag: protected
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BuddyPress Members Only
BuddyPress Members Only restricts Your Buddypress and WordPress to logged in/registered members.
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Multiple Post Passwords
Set multiple passwords for your protected pages so you can give them to different users.
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WP Basic Authentication
Basic Authentication for protected your development WordPress site like .htpasswd
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Force Login
Force Login is a simple lightweight plugin that requires visitors to log in to interact with the website.