Related web guides
Social Justice Through Data (tips for engaging viewers from MIT blog)
Selected tools (Datavisualization.ch)
22 free tools for data visualization and analysis (Computer World)
Essential Collection of Visualisation Resources (Visualisingdata.com)
Visualization Tools (Visualizingadvocacy.com)
Basic chart and graph applications
Datawrapper Upload your data (as CSV) or copy/paste it into this free web application to make a quick chart that is publishable to the web.
DevInfo Web-based platform designed by United Nations Development Group for finding and visualizing UN data, but also allows personal data upload via CSV or copy/paste of text.
Palladio Web-based platform designed at Stanford for digital humanities projects.
RAW Highly customizable web-based tool for creating a variety of data visualizations.
More sophisticated options
Tableau Public Free downloadable software that works well with survey data, allowing you to filter data and recode variables, as well as create a variety of charts and graphs.
SDA (Survey Documentation Analysis) Developed at UC Berkeley, SDA is a web-based tool that is integrated into various collections of survey data, including the General Social Survey (GSS) and the American National Election Study (ANES), as well as microdata found in the Integrated Public User Microdata Series (IPUMS) which includes a more fine-grained version of Census data.
Gephi Open source platform for visualizing networks and complex systems, including dynamic and hierarchical graphs.
Fully featured analytic software
The following professional-grade software packages allow you to manipulate and visualize quantitative data in very complex ways:
SAS Powerful statistical analysis and data management tool, uses command-line interface, steep learning curve
Stata Powerful statistical analysis, not as strong at data management as SAS, good combination of ease and power
SPSS Relatively sophisticated statistical analysis tool with a user-friendly GUI
R Free, versatile option for data analysis and visualization
How do I choose?
Choosing statistical software (online video, 36 minutes)
Detailed comparison between SAS, STATA, and SPSS (Institute for Digital Education & Research, UCLA)
Themed visualization applications
World Bank Data Visualizer uses "bubble charts" to display social, economic, and health data from over 200 countries.
Gapminder is a tool for exploring and comparing global development indicators
Sunlight Foundation makes available a number of visualization tools related to politics and transparency, including "Lobbying Tracker" which tracks lobbying activity and "Capitol Words" which explores the most popular words and phrases used by legislators in the U.S. Congress.