WordPress.org

The zLinks plugin is simple to install and get working:

1. Unzip the distribution package locally
2. Upload the folderzlinks and its subdirectories to the /wp-content/plugins/ directory
3. Activate the plugin through the 'Plugins' menu in the WordPress Administration panel.

That's it!

All links within your blog posts and comments will now display an icon to its immediate right, which your blog readers may click to invoke a popup with additional links and resources related to that link.