Example Screencapture video:
Installation:
1) Download plugin .ZIP file.
2) Open WeBuilder and select "Plugins -> Manage Plugins" from the menu.
3) Click "Install" and select the .ZIP file you downloaded in step 1.
Usage:
Type in a keyword like "jquery" and activate the plugin.
The plugin will then find the latest verston of jquery at cdnjs.com and replace the keyword with a link to the JavaScript file.
Feedback appreciated.

(I only use WeBuilder, so I haven't tested if it works in HTMLPad, Rapid CSS or Rapid PHP.)