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CSS

Flexbox cheat sheet
Transform cheat sheet
Transition cheat sheet
Image code generator
Button code generator
Box-shadow code generator
Text-shadow code generator
Transform code generator

jQuery-UI

Effect code generator
Effects cheat sheet

JavaScript

Dynamic script loader

Node.js

package.json skeletons

Tools

Calculator using math.js

jQuery

Animate easing code generator
Animate easing cheat sheet