Most data is meaningless to most people — unless it is visualized. Stepping beyond familiar visualizations like bar charts and pie charts, there are many approaches to visualizing data, from mapping (e.g., color coding a map to show voting patterns) to visualizing networks (e.g., the links between people).
Arbor.js is a library of force-directed layout algorithms plus abstractions for graph organization and refresh handling.
CartoDB is a web service for mapping, analyzing and building applications with data.
Circos is a software package for visualizing data in a circular layout.
Cubism.js is a library for creating interactive time series and horizon graphs based on D3.js
Dance.js is a simple data-driven visualization framework based on Data.js and Underscore.js
DataWrangler is an interactive web application for data cleaning and transformation.
Degrafa is a powerful declarative graphics framework for rich user interfaces, data visualizations and mapping.
Envision.js is a library for creating fast, dynamic and interactive time series visualizations.
Flare is a set of software tools for creating rich interactive data visualizations in Flash (ActionScript). Note, Flash is increasing an obsolete choice of platform because it is rarely supported on mobile devices.
GeoCommons is a public community and set of tools to access, visualize and analyze data with compelling map visualizations.
Gephi is a visualization and exploration platform for networks with dynamic and hierarchical graphs.
Google Chart Tools is a collection of simple to use, customizable and free to use interactive charts and data tools.
Google Fusion Tables is a web application that makes it easy to host, manage, collaborate on, visualize, and publish data tables.
Google Refine is a tool for working with data, cleaning it up, reformating it or extending it with web services.
Impure / Quadrigram is a visual programming language aimed to gather, process and visualize information.
Kartograph is a simple and lightweight framework for creating beautiful, interactive vector maps.
Many Eyes is a web application to build, share and discuss graphic representation of user uploaded data.
MapBox is a web platform for hosting custom designed map tiles and a set of open source tools to produce them.
Miso Dataset is a client-side data transformation and management library to loade, parse, sorte, query & manipulate data.
Mr. Data Converter is a web application that converts Excel data into one of several web-friendly formats, including HTML, JSON and XML.
NodeBox is a desktop application that lets you create generative, static, animated or interactive visuals.
Paper.js is a vector graphics scripting framework in a well designed, consistent and clean programming interface.
Peity is a simple jQuery plugin that converts an element’s content into a simple mini pie, line or bar chart.
Polymaps is a library for making dynamic, interactive maps with image- and vector-based tiles.
Prefuse is a set of software tools for creating rich interactive data visualizations in Java. Note that Java is increasingly marginalized, and is not a good choice for most mobile development.
Processing is an open source programming language and environment to create images, animations, and interactions. Processing.js is the sister project of Processing that makes projects work using web standards and without any plug-ins.
Protovis is a library that composes custom views of data with simple marks such as bars and dots.
R is a software environment for statistical computing and graphical techniques. It’s a complex language, but highly favored by people who have to process a lot of numerical-type data.
Raphaël is a small library that simplifies working with vector graphics on the web.
Rickshaw is a library for creating interactive time series graphs based on D3.js.
Sigma.js is an open-source lightweight library to display interactively static and dynamic graphs.
Tableau Public is a desktop application to build and post interactive graphs, dashboards, maps and tables to the web.
Tangle is a library that allow to interactively explore, play, and see the document update immediately.
Timeline is a tool to create timelines with data and media from different sources like Google Docs, Twitter, Flickr or Vimeo.
For more information on any of the above, and a fresh list of anything new, see the selected tools compiled by DataVisualization.ch.
Also, IDEA’s SpicyNodes project is a way to easily display concept-map type visualizations. Currently available in web browsers using Flash, and coming to the iPad in 2013.