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
Email Popup by Optin Cat Helps You Convert More Blog Visitors Into Subscribers. Create Email Popup In Less Than 2 Minutes.
The MailChimp Forms by Optin Cat WordPress Plugin Makes It Super Simple To Create Beautiful MailChimp Sign-up Widgets & Forms In Minutes.
Lightbox Gallery plugin is allow users to view larger versions of images, simple slide shows and Gallery view with Responsive grid layout.
OptinMonster helps you grow your email list by converting visitors into subscribers and customers. Get more email subscribers now!
Lightbox is the perfect tool for viewing photos.
Lightbox Slider plugin is allow users to view larger versions of images, simple slide shows and Gallery view with grid layout.
Create a simple, non-annoying lightbox popup in your blog.
Easily create a popup for your WordPress site.
Huge-It Popup Colorbox is the most spellbinding plugin in WordPress that implement Lightbox-effect look of the images and videos
Introducing Arty Popup - a popup plugin for designers.
ITRO Popup display a popup to your WP site: ★ Age validation for adult-content site ★ Fully customizable with WP Post Editor ★ Very easy to use
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.
A very attractive notification popup plugin which gives you a functionality to show your Notification when any user visit your WordPress site.
Clifton's Lightbox implements a lightbox subscription form overlay. Features a title, list, call-to-action, and image or video.