WP Notify

WP-Notify is a notification plugin, this will help you to notify or alert informations about latest posts/system maintenance time etc to your visitors.
The plugin have an admin area, from there you can choose what type of message you want to show and which style you want to use. You can change the color and
display styles from the dropdown list. Three styles are there, StackOverFlow, Safari Alert and Facebook Style, and three events are on load, on
scroll and on mouse move.

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WP-Notify