Sheetrock
Quickly connect to, query, and lazy-load data from Google Spreadsheets.
Onionskin
A client- and server-side multi-layer cache manager library
Canvas Xpress
JavaScript VisualizationTools
Slick Grid
A lightning fast JavaScript grid/spreadsheet
Jszip
Create, read and edit .zip files with Javascript
Alchemy
Alchemy.js is a graph drawing application built in d3.
J Schema
A simple, easy to use data modeling framework for JavaScript
Tiny Slider
Vanilla javascript slider for all purposes.
Lowdb
An extendable JSON database for Node and the browser powered by lodash
Flot
Flot is a pure JavaScript plotting library for jQuery, with a focus on simple usage, attractive looks and interactive features.
Convnetjs
Deep Learning in Javascript. Train Convolutional Neural Networks (or ordinary ones) in your browser.
Faye
Simple pub/sub messaging for the web
Dataset
JavaScript library that makes managing the data behind client-side visualisations easy
Clusterize.js
Tiny vanilla JS plugin to display large data sets easily
Aja.js
Ajax without XML : Asynchronous JavaScript and JavaScript/JSON(P)