Multiple Featured Images is a free wordpress plugin to add additional featured images to a post or page.
Main features:
Add as many featured images as you need
Fully customizable output
To install Multiple Featured Images
Login to wordpress (wp-admin).
In your admin dashboard click plugins and select Add New.
Type Multiple Featured Images in the search field and click Search Plugins button.
Install Multiple Featured Images.
After the successfully Installation click the activate Plugin link to activate the plugin.
[OR]
Download Multiple Featured Images wordpress plugin. Download link.
Unzip and upload it to your WordPress wp-content/plugins directory.
Login to wp-admin. In your admin dashboard click plugins and activate the Multiple Featured Images wordpress plugin