Best WordPress iframe popup plugin

Popliup is a plugin for displaying popups on your wordpress site.

Free version features 

• Display popup after some time or on user scroll
• Hide popup to the user if once shown
• Set conditions regarding when and on which page the popup will be shown
• Customize appearance, overlay color, popup width and opacity
• Includes two free customizable themes
• Free support, help and updates

Download this plugin click here