We all install cool plugins on our WordPress sites. Not all of these plugins stick around in the WordPress.org plugin directory forever though. Plugins get removed from that directory for various reasons. Keeping them active without doing some research can be quite risky. Deleting plugins that have been removed and replacing them with other alternatives are a good idea. No Longer In Directory is a simple WordPress plugin that shows you whether the plugins you are using are still available in the WordPress directory.
No Longer in Directory is fairly straight forward to use. Just activate it and go to Plugins > No Longer in Directory section of your site to find out which plugins have been removed from the WordPress.org directory. I like the fact that this plugin shows you which plugins have been removed for security reasons. It also includes links to Secunia Advisory as well.
Plugins get removed from WordPress.org directory for various reasons. It is not always a deal breaker unless you are dealing with a security issue or a rogue plugin. Thanks to No Longer in Directory, you can quickly find out which plugins have been booted from the directory .