Alchemy
Alchemy.js is a graph drawing application built in d3.
Slick Grid
A lightning fast JavaScript grid/spreadsheet
Synaptic
architecture-free neural network library for node.js and the browser
Reasondb
A 100% JavaScript object database: SQL like syntax, full-text search, auto object sync, swapable persistence engines, asynchronous cursors, streaming analytics, 18 built-in plus in-line fat arrow predicates, predicate extensibility, indexed computed values, joins, nested matching, statistical sampling and more.
Out Front Js
Console for mobile browsers and webviews.
Aja.js
Ajax without XML : Asynchronous JavaScript and JavaScript/JSON(P)
Forerunner Db
A JavaScript database with mongo-like query language, data-binding support, runs in the browser as a client-side DB or on the server via Node.js!
Jszip
Create, read and edit .zip files with Javascript
Sheetrock
Quickly connect to, query, and lazy-load data from Google Spreadsheets.
Smoothie
Smoothie Charts: smooooooth JavaScript charts for realtime streaming data
Knex
A query builder for PostgreSQL, MySQL and SQLite3, designed to be flexible, portable, and fun to use.
Dc.js
Multi-Dimensional charting built to work natively with crossfilter rendered with d3.js
C3
A D3-based reusable chart library
Lowdb
An extendable JSON database for Node and the browser powered by lodash
Tiny Slider
Vanilla javascript slider for all purposes.
Tabletop
Tabletop.js gives spreadsheets legs
Convnetjs
Deep Learning in Javascript. Train Convolutional Neural Networks (or ordinary ones) in your browser.