Open-source development tools

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http://www.axiis.org/ Whether you are building elegant charts for executive briefings or exploring the boundaries of advanced data visualization research, Axiis has something for you. Axiis provides both pre-built visualization components as well as abstract layout patterns and rendering classes that allow you to create your own unique visualizations.

Axiis

Exhibit lets you easily create web pages with advanced text search and filtering functionalities, with interactive maps, timelines, and other visualizations like these: http://www.simile-widgets.org/exhibit/

Simile

Protovis

http://mbostock.github.com/protovis/ Protovis is no longer under active development. The final release of Protovis was v3.3.1 (4.7 MB) . The Protovis team is now developing a new visualization library, D3.js , with improved support for animation and interaction. D3 builds on many of the concepts in Protovis; for more details, please read the introduction and browse the examples . This project was led by Mike Bostock and Jeff Heer of the Stanford Visualization Group , with significant help from Vadim Ogievetsky .