Punycode.js
A robust Punycode converter that fully complies to RFC 3492 and RFC 5891, and works on nearly all JavaScript platforms.
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
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.
Faye
Simple pub/sub messaging for the web
Tiny Slider
Vanilla javascript slider for all purposes.
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)