jScrollPane
Pretty, customisable, cross browser replacement scrollbars
Responsive Comments
A client-side solution to conditional loading.
Turbolinks
Turbolinks makes navigating your web application faster
Jquery Waypoints
Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element.
Persist State
jQuery Ui widget that will transparently save the state of checkboxes, inputs, selects, etc in localStorage, restoring these on the user's next visit to the page.
Node List.js
NodeList implementation/library - Use the Native DOM APIs as easily as jQuery
Viewport
Gets the dimensions of the Viewport and beyond.
Scrob Master
Master your scroll events.
Veinjs
Injects CSS into the document (it's a perfectly legal procedure)
Porthole
A proxy to safely communicate to cross-domain iframes in javascript
Fragment.js
A tiny tool for easily loading html fragments and templates
Resize Observer
Polyfills the ResizeObserver API.
Double
jQuery plugin for hiring doubles
Is Near
Calculates if the mouse position is near to a given element.
Egjs Infinitegrid
A module used to arrange card elements including content infinitely on a grid layout.
Packery
bin-packing layout library
Eqcss
EQCSS is a plugin that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up