The PopUp plugin is a highly effective tool for getting visitors connected to your mailing list or simply showing ads, attractive, extremely fast and non annoying pop up box for your WordPress Blog.Here List of the Best 10 WordPress Popup Plugins.
Simple Popup Plugin
The function of this plugin is to easily create links to simple popup windows. It supports multiple popup links on posts/pages/widgets and window positioning/centering options.
WordPress PopUp
This plugin has quite a bit of built-in flexibility to it so that you can use it exactly where you want it, instead of being forced to display the popup in one way across the board. The best part is that this plugin is ridiculously easy to use. Simply paste in your ad code. It can be Javascript, text, an image, or any combination. You don’t need to be a developer to have this working on your website in a matter of a couple minute
MaxBlogPress Unblockable Popup
MaxBlogPress Unblockable Popup is made by the same people who created the Subscribers Magnet, but this plugin only does popups.
WP-Announcements
The WP-Announcements plugin is ideal for websites or blogs that would like to display a site wide announcement, featured post, important message, community notice, advertisement, survey form, email subscription form, emergency alert or anything you can publish in a post as a marquee or popup window using ShadowBox-JS or ThickBox.
Scrolling down popup plugin
Scrolling down popup plugin create the popup window with drop in scrolling effect. With this plugin we can confirm that particular content on your page gets attention to user. To display important announcement, an advertisement, or a promotional offer we can use this plugin.
WP Super Popup
WP Super Popup makes you able to easily create and manage modal and unblockable popups for your WordPress blog. It is proved that a modal and graphically attractive popup (like the one generated by this plugin) have an high conversion! For example you can use it for creating subscription forms or to promote your product in a viral way.
WP EmailFeedburnerPop
WPEmailFeedburnerPop is a plugin based on lightbox, with wich you could make your users suscriptions to your feedburner quickly and easy.
FasterIM Opt-In
FasterIM Opt-In is a free WordPress popup plugin for Internet Marketers. Because of its focused purpose, it is easy to set up but you may need to tweak it a little to make it work properly/ as wanted. The feature list include:
Simple PopUp
A simple, attractive, non-annoying, extremely fast and light-weight pop-up box for your WordPress Blog. Supports Cookies,Custom design options,scheduling and custom Visual Edior where you can put your html code which will be showed to your visitors.
Popup
WordPress popup plugin create a popup message to your website. Sometimes its useful to add a popup to your website to show your ads, special announcement and for offers. Using this plug-in you can create unblock-able, dynamic and fully configurable popups for your blog.