This plugin is very important to me.
I had problems with a SCRIPT tag. Each time i used to embed script tag code, the script code used to disappear.
So in installed this plugin, i went to the screen options, in my posts, i activated "custom fields". I added the script code to a custom field and then i added the shortcode to my post where i want to add the script.
It is still working today and i don't see any alternatives.