Simon

This plugin creates a full screen ad with an expiration date without cloaking. All you have to do is add a link, image and expiration and you can have a full screen ad with a cookie.
There are plugins out there that create separate full page ads or landing pages versus what Google sees. So the plugin would show the user one page while showing another page to a search engine. This can be called cloaking which is never really a good strategy to show ads or landing pages.
This plugin doesn’t create landing pages. This plugin creates full page ads to promote your product or service without cloaking.

Mega Ad

This plugin creates a full screen ad with an expiration date without cloaking.

John Morris

Do you use the “Remember Me” feature when logging in to your WordPress site? I know I do.
Do you find it annoying when WordPress stops remembering you after a few days? I know I do.
Longer Login is a simple WordPress plugin that remedies this. By default, WordPress automatically 
forgets users after 14 days. This plugin adds an option in your website’s General Settings that 
can change this expiration date. There are numerous options ranging from 1 day to 1 year.
Change the setting, and the next time you, or any user on your site logs in with “Remember Me” checked, 
WordPress will keep them logged in for that specified time.
<h4>How Does It Work?</h4>
To remember users, websites store a small piece of information in your web browser’s memory. 
This token of information is called an <a href="wikipedia.org/wiki/HTTP_cookie" rel="nofollow ugc">HTTP cookie</a>. These 
cookies have an expiration date specified by the website.
By default, WordPress websites have their persistent login cookies expire after 14 days. This plugin 
changes the length of time the cookie will survive. Instead of 14 days after login, you can make the 
cookie live for as long as 1 year after login.

Longer Login ("Remember Me" Extension)

Longer Login allows customizing the length of WordPress' "Remember Me" length. No more automatic logouts every few days!

Mega Ad vs Longer Login ("Remember Me" Extension)