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
The Best WordPress PopUp optin plugin to help you gain more subscribers, social followers or advertisement. Responsive pop-ups with friendly options
Plugmatter Optin Feature Box is the Only List Building Plugin that Allows You to Create High Converting Optin Feature Boxes for Your WordPress Site.
Pop-up plugin with professional templates.
Lightbox is the perfect tool for viewing photos.
Increase your followers ratio 40% with the new Popups - Multiple popup options, scroll triggered popups with multiple options
Uji Popup - Create your custom popup.
Easily turn users into cash using Popup Maker - the most versatile & expansive popup plugin for WordPress!
WP Popup plugin is beautifully designed and elegant plugin with focus on ease of use and functionality. Create unlimited Popups with subscriber forms.
PopupAlly allows you to create advanced popup signup forms in under 5 minutes without the need to deal with messy code.
Huge-It Popup Colorbox is the most spellbinding plugin in WordPress that implement Lightbox-effect look of the images and videos
Create responsive and working subscriber form popups with popup revolution.
Stable: 1.0 Increase user interactivity and create curiosity by welcoming your visitors with a personalized message via Popup message. This plugin wi
Supercharged WordPress Popup Plugin. Best way in the world for you to create unique unblockable WordPress popups to grow your list of subscribers!
Email opt-in widget that gathers visitors’ emails while they surf your site. Creates email collection popup in bottom right or middle of screen.