Would you like more sales? Do you have blog posts and want to offer some related products from your WordPress webshop? Do you have a Real Estate Agency Plugin and want to connect to them posts introducing the neighborhood? Do you have a custom movie catalog plugin and want to associate some articles to your movies?
You need WordPress Related Items plugin, which supports cross post type relationships. Specify unique attributes that define how to display related items for different type of reference items. Such a matrix-like way you can specify all necessary variations of display settings.