Cubism.js is a D3 plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from Graphite, Cube and other sources. Cubism is available under the Apache License on GitHub.

JavaScript libraries related to different file types.

A lightweight javascript date library for parsing, manipulating, and formatting dates.

Minim is an audio library that uses the JavaSound API, a bit of Tritonus, and Javazoom’s MP3SPI to provide an easy to use audio library for people developing in the Processing environment. The philosophy behind the API is to make integrating audio into your sketches as simple as possible while still providing a reasonable amount of flexibility for more advanced users.

Backbone supplies structure to JavaScript-heavy applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing application over a RESTful JSON interface.

Seadragon Ajax is a Seadragon viewing library implemented in pure JavaScript. It supports the same single image file format that Silverlight Deep Zoom uses, but does not support Deep Zoom Collections.

Unity is a multiplatform game development tool, designed from the start to ease creation. A fully integrated professional application, Unity just happens to contain the most powerful engine this side of a million dollars.

DNS, DHCP and Bonjour library for Arduino - with, *gasp*, documentation! Now make nifty networked things (via @gkaindl)