Tippyjs
Highly customizable vanilla JS tooltip/popover library
Masonry
Layout elements in a grid, like a mason fitting stones in a wall
Dom Purify
DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo:
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Sizzle
A sizzlin' hot selector engine.
Vue Js Modal
:pizza: Simple to use, highly customizable, mobile friendly Vue.js 2.0+ modal.
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Moveable
↔️ ↕️ 🔄 Moveable! Draggable! Resizable! Scalable! Rotatable!
Fastdom
Eliminates layout thrashing by batching DOM read/write operations
Prefixfree
Break free from CSS prefix hell!
Imba
The new programming language for web apps
Bespoke.js
DIY Presentation Micro-Framework
Prototype
Prototype JavaScript framework
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
Mootools Core
MooTools Core Repository
Packery
bin-packing layout library
Mercury
A truly modular frontend framework