Add Adwords, Facebook pixel or any Conversion Tracking scripts using variables like product ID, post id, title or custom ones.
This plugin lets you insert any marketing script anywhere you want, before the head element closes, after the body or even before the body tag closes.
Also you can use custom variables to share between scripts like conversion id or Facebook pixel id. as well as dynamic ones like product id.
Also you can set your scripts to show in specific pages or events like right when somebody completes an order or when they are in a product page in case you are using Woocomerce.
Premium version
With the premium version you have no limits in variables or scripts and you get much more options, you can check out here if you want more power to your marketing scripts:
http://www.ultimateconversiontrackingcode.com/
Screenshots
Here you can see how you can manage all your scripts and custom variables.
here is how you set each script with custom variables, remember to wrap the variable in curly brackets {variable_name}