fedmich

This plugin will insert urls of JavaScript or CSS stylesheet files added into a particular posts or page via Custom Fields. 
The scripts (link stylesheet) tags will be then added in your tag 
It doesn’t require other plugin and it can be used as is.

Insert JS or CSS in post via Custom Field

This plugin will insert urls of JavaScript or CSS stylesheet files added into a particular posts or page via Custom Fields.

sakaitaka

Compress HTML Code, And Converting Inline Script and Style To JavaScript and CSS Compressed File.

WP Fast Minify

This is a simple plugin that cleans up the code. I myself use it on various sites.

The simple plugin that cleans up the code

Compress HTML Code, And Converting Inline Script and Style To JavaScript and CSS Compressed File.

Insert JS or CSS in post via Custom Field vs WP Fast Minify