A front-end developer toolkit

Because I think that the best css/js toolkit is composed by many agnostic micro libraries.

• Sass MQ

  A Sass mixin that helps you compose media queries in an elegant way.

  My favourite to make perfectly customized media queries

  https://github.com/sass-mq/sass-mq

• LazySizes

  High performance and SEO friendly lazy loader for images (responsive and normal), iframes and more, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.

  Amazingly powerfull

  https://github.com/aFarkas/lazysizes

• Flickity

  Touch, responsive, flickable carousels

  Not perfect, but better than buggy owl carousel

  https://github.com/metafizzy/flickity

• Toggles Switches

  A declarative pattern for applying CSS states and animations based on user interaction

  For things like responsive nav

  https://github.com/digitalsurgeons/toggles-switches

• Impetus

  Agnostic utility for adding momentum to anything. It's like iScroll, except not for scrolling. Supports mouse and touch events.

  Simple but very limited (no callbacks)

  https://github.com/chrisbateman/impetus

• PhotoSwipe

  JavaScript image gallery for mobile and desktop.
  https://github.com/dimsemenov/PhotoSwipe

Untested

• Sass burger

  A Sass mixin for creating hamburger icons.
  https://github.com/jorenvanhee/sass-burger

• Flow.js

  A JavaScript library providing multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API.
  https://github.com/flowjs/flow.js

• Dragdealer

  Drag-based JavaScript component, embracing endless UI solutions

  Untested but very promising

  https://github.com/skidding/dragdealer

jQuery dependency

• Zoom.js

  Medium's Image Zoom for jQuery
  https://github.com/fat/zoom.js