jimbo2150

This plugin extends the WP_Scripts class, adding some additional methods and filters that overload the existing script output to add Require.js syntax. It loads scripts via Require.js and by default defers until the DOMContentLoaded event fires (unless a manually added require() is called within the head/body and does not wait for the DOM to be loaded. 
It is designed to work in conjunction with HTTP/2 but will function fine without it (though you may see slower load times).
This plugin is design to assist developers in updating and creating JavaScript that is asynchronous – that is, scripts that can load in a different order and do not assume that their dependencies are available immediately. Use of the Asynchronous Module Definition (AMD) allows a script to define it’s dependencies and have them loaded asynchronously prior to the entire script or the initialization portion executes.
It is common for larger projects to concatenate together scripts however, they can end up a jumbled mess and smaller required functions are often duplicated (and redundant) across multiple scripts. HTTP/2 corrects this by allowing multiple resource files to be requested and downloaded within a single TCP window. As projects get larger and more diverse it is becoming more economical to load the individual components (modules) that are needed rather than download and execute one massive concatenated script file (which can also cause the browser to freeze up).
NOTE: This plugin currently only replaces non-administrative (front-end) scripts with Require.js syntax.
Plugin website: https://techie-jim.net/wordpress-plugins/requirewp/

RequireWP

Uses Require.js to load scripts faster and speed up WordPress / increase site load speed & performance. Designed to work with HTTP/2.

PiotrPress

Clearcode

The CC-Scripts plugin gives Admin users the ability to add custom JavaScript code to every page on WordPress website in the head/footer and/or directly after the opening body html tag. 
Additionally, you can minify scripts using JSMin php library and/or displaying it selectively using dependencies. 
The best part is that you can do this from the Admin panel, perfect for those who don’t have the programming skills needed to manually add custom JavaScript code to template files.

CC-Scripts

Add custom JavaScript code to all your WordPress pages at once via the Admin panel.

RequireWP vs CC-Scripts