resources 
Modest Maps
Display and interaction library for tile-based maps in Flash and Python.
tags: tools visualization
Mesh Processing Library
Library for creating Voronoi, Delaunay and Convex Hull diagrams in Processing. By Lee Byron.
tags: tools visualization
Show Us a Better Way
UK government-sponsored competition for ideas on how to put public data to good use.
tags: inspiration
Mapstraction
Mapstraction provides a common API for various JavaScript mapping APIs, allowing developers to easily change the mapping provider of their application.
tags: tools visualization
Beautiful Soup
Python HTML/XML parser, for screen-scraping data sources that don't yet offer downloadable data or an API.
tags: tools
Obsessing
Web-based Processing.js sandbox.
tags: tools visualization
Processing.js
A JavaScript version of the Processing visualization language. By John Resig.
tags: tools visualization how to
WikiViz: Tools
Annotated list of tools for data visualization.
tags: tools visualization repository
Prefuse Visualization Toolkit
Free set of tools for creating rich interactive data visualizations.
tags: tools visualization how to
Numbrary
Free library of useful numbers.
tags: repository
CKAN - Comprehensive Knowledge Archive Network
Large registry of open knowledge packages and projects.
tags: repository
Hpricot HTML Parser
A fast and delightful HTML parser for Ruby, for data sources that don't yet offer downloadable data or an API.
tags: tools
Flowing Data
Blog that explores how statisticians, designers, computer scientists and others are using data to help us understand more about ourselves and our surroundings.
tags: blog visualization how to
Flare Visualization Toolkit
A collection of ActionScript 3 classes for building interactive visualizations on the web.
tags: tools visualization how to
Graphviz
Open source graph visualization software with a web interface.
tags: tools visualization how to
Sunlight Foundation
Nonprofit organization that supports, develops and deploys new internet technologies to make information about the activities of the U.S. federal government more accessible to Americans.
tags: inspiration
public.resource.org
Pointers to public repositories of restriction-free government data and media initiated by Carl Malamud, a leading proponent for online access to U.S. public information.
tags: repository
Jon Udell's Interviews with Innovators
Podcast series that frequently explores issues surrounding online access to government data.
tags: inspiration
Many Eyes
Shared data visualization and discovery, from the IBM Visual Communication Lab.
tags: visualization repository
Swivel
Upload and explore data.
tags: visualization repository
Infochimps.org
Very large repository of free rich datasets.
tags: repository
Processing
Open source programming language and environment for programming images, animation and interactions. Often used for data visualization.
tags: tools visualization how to
theinfo.org
Excellent resource on the ins and outs of dataset handling. A place to exchange tips and tricks, share tools and integrate projects. Join the mailing lists.
tags: how to