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!
Dygraphs
Interactive visualizations of time series using JavaScript and the HTML canvas tag. The dygraphs JavaScript library produces interactive, zoomable charts of time series.
Sheetrock
Quickly connect to, query, and lazy-load data from Google Spreadsheets.
Smoothie
Smoothie Charts: smooooooth JavaScript charts for realtime streaming data
Crossfilter
Fast n-dimensional filtering and grouping of records.
Datamaps
Maps for interactive data visualizations in Javascript
Countable
Countable is a JavaScript function to add live paragraph-, word- and character-counting to an HTML element.
Lowdb
An extendable JSON database for Node and the browser powered by lodash
C3
A D3-based reusable chart library
Slick Grid
A lightning fast JavaScript grid/spreadsheet
Dimple
An object-oriented API for business analytics
jQuery File Upload
File Upload widget with multiple file selection, drag&drop support, progress bars and preview images for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing. Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads.
Tiny Slider
Vanilla javascript slider for all purposes.
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.
Clusterize.js
Tiny vanilla JS plugin to display large data sets easily
Aja.js
Ajax without XML : Asynchronous JavaScript and JavaScript/JSON(P)