WP Lightbox 2 is awesome tool for adding responsive lightbox effect for images and also create lightbox for photo album/gallery on your WordPress blog
Lightbox is the perfect tool for viewing photos.
Display a popup to your WordPress site: age restriction popup for adult-content site ★ multilanguage popup with qTransalte-X ★ very easy to use
OptinMonster helps you grow your email list by converting visitors into subscribers and customers. Get more email subscribers now!
An ultra lightweight jQuery lightbox for WordPress images and galleries.
Create a simple, non-annoying lightbox popup in your blog.
Lightbox - Gallery Lightbox WordPress plugin is an high customizable and responsive product for displaying images and videos in popup.
Popup Colorbox is the most spellbinding plugin in WordPress that implement Lightbox-effect look of the images and videos.
WP Modal Popup with Cookie Integration is the smart, responsive, customizable and beautifully coded popup for visitors with cookie integration.
Clifton's Lightbox implements a lightbox subscription form overlay. Features a title, list, call-to-action, and image or video.
Email Popup by Optin Cat Helps You Convert More Blog Visitors Into Subscribers. Create Email Popup In Less Than 2 Minutes.
Convert anonymous visitors into subscribers and customers with 40Nuggets' intelligent screen overlays
Widgetic makes it easy to create beautiful widgets for your WordPress site.
Easily create a popup for your WordPress site.
Popup a Poll, Survey, Quiz or Form. The popup boosts time on site and page views. Manage the popup assignment & configurations.
Add a custom popup to any page.
Introducing Arty Popup - a popup plugin for designers.
A very attractive notification popup plugin which gives you a functionality to show your Notification when any user visit your WordPress site.
Clean announcement plugin that reveals a neat popup when users visit your site. You can set who sees the announcement and when to display it.