Jit
The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web
Canvas Xpress
JavaScript VisualizationTools
Plottable
A library of modular chart components, built on D3
Local Storage
A localStorage polyfill
jQuery JSONP
jquery jsonp plugin
Money.js
money.js is a tiny (1kb) javascript currency conversion library, for web & nodeJS
Zangodb
MongoDB-like interface for HTML5 IndexedDB
Rusha
High-performance pure-javascript SHA1 implementation suitable for large binary data, reaching up to half the native speed.
Z.js
turns content (in)visible
D3 Cloud
Create word clouds in JavaScript.
JSON.js
JSON in JavaScript
Polychart2
Version 2 of Polychart.js
Uv Charts
Simple yet powerful JavaScript Charting library built using d3.js
Isjs
Check your data against regular expressions or known keywords.
Vague Time
A tiny JavaScript library that formats precise time differences as a vague/fuzzy time, e.g. '3 months ago', 'just now' or 'in 2 hours'.
Ramda Extension
🤘Utility library for functional JavaScript. With ❤️ to Ramda.
Backgrid
Finally, an easily stylable semantic HTML data grid widget with a Javascript API that doesn't suck.