engasm89

The plugin is easy to use and it has a simple, user-friendly interface. 
It is also highly configurable, so you can customize it to meet your specific needs. 
The WordPress External Link Redirection plugin is free. 
It can help you triple your income from your ads by showing people more ads when they visit external links inside your articles or pages

External Link Redirection

The WordPress External Link Redirection plugin allows you to manage your site's external links and forward people to a waiting page with ads to m …

cubecolour

A simple and lightweight plugin to indicate external http and https links in posts, pages and custom content by appending a small diagonal arrow icon to the link.
No configuration is required just install and activate.

Indicate External Links

Very reliable has survived many Wp updates and just keeps working.

This plugin just keeps on working

Indicates external links in post, page and custom content.

External Link Redirection vs Indicate External Links