Count Up.js
Animates a numerical value by counting to it
Math Jax
Beautiful math in all browsers
Tether
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
Choo
:steam_locomotive::train: - sturdy 4kb frontend framework
Numeral
A javascript library for formatting and manipulating numbers.
Cyclejs
A functional and reactive JavaScript framework for predictable code
Cropper
A simple jQuery image cropping plugin.
Cycle Core
A fully reactive JavaScript framework for Human-Computer Interaction
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Offline
Automatically display online/offline indication to your users. #hubspot-open-source
UA Parser
Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as jQuery plugin.
I18next
Internationalisation (i18n) with javascript the easy way (incl. jquery plugin)
FancyBox
FancyBox is a tool that offers a nice and elegant way to add zooming functionality for images, html content and multi-media on your webpages.
Tracking.js
The tracking.js brings to web elements tracking techniques of a real scene captured by the camera, through natural interactions from object tracking, color markers, among others, allowing the development of interfaces and games through a simple and intuitive API.
Fuelux
Extends Twitter Bootstrap with additional lightweight JavaScript controls. Easy to install, customize, update, and optimize. All functionality covered by live documentation and unit tests.
Rickshaw
JavaScript toolkit for creating interactive real-time graphs
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.