Tether
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
Mag.js
MagJS - Modular Application Glue
HtmlJs
HTML render engine and data binding (MVVM)
Minified.js
Replace jQuery or MooTools with a <4kB Library
React Virtualized
React components for efficiently rendering large lists and tabular data
Wow
Reveal CSS animation as you scroll down a page
Resize Observer
Polyfills the ResizeObserver API.
Do Mtastic
Small & fast DOM and event library for modern browsers.
Rye
A modern, lightweight browser library using ES5 natives
Is Near
Calculates if the mouse position is near to a given element.
Gliojs
Exit popup easely. Detects if the mouse of a user leaves the viewport borders of your website
Node List.js
NodeList implementation/library - Use the Native DOM APIs as easily as jQuery
Design Blocks
A set of 170+ Bootstrap based design blocks ready to be used to create clean modern websites.
Nested
Gap free multi column grid
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Phantomjs
Scriptable Headless WebKit
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)