hauxh

This plugin allows you to require a secret key that is passed via the URL: http://example.com/post-title/?key=[string] 
Specify the key in a custom value called “key” with the [string] or use the built in widget.
Stable version of the plugin are pushed to the WordPress repository, 
but the latest version of the plugin can be found at: 
https://bitbucket.org/excion/wpkeyme/
Issues/Bugs: https://bitbucket.org/excion/wpkeyme/issues

WPKeyMe

This plugin allows you to require a secret key that is passed via the URL: http://example.com/post-title/?key=[string]

rtowebsites

With this plugin can you replace every string in wp_posts, post-meta and wp_options.
You can help to develop on 
https://github.com/RTO-Websites/WordPress-MultiReplace

MultiReplace

With this plugin can you replace every string in wp_posts, post-meta and wp_options.

WPKeyMe vs MultiReplace