WP Coder Extension
Plugin WP Coder - will allow you to insert HTML, CSS, and JS on the pages of your site without interfering in the code of the theme. With this plugin, you can easily implement the scripts and styles on your site, thus making it dynamic and attractive.
Show depending on the language (allows creating multi-language)
Show depending on the user (for all users, only for logged-in users, only for not logged-in users, user role)
Show on the selected pages (all page, exclude page, taxonomy page)
Devices control show (display code on mobile devices only, desktop-only or all devices)