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Google Chart Tools
Javascript API from Google to easily create visualization charts, also from real-time data.
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Journalism in the Age of Data - ...
Video report on data visualization as a storytelling medium (54 min)
produced during a Knight Journalism Fellowship (2009-2010).
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JavaScript InfoVis Toolkit
Javascript toolkit for creating data visualizations with support of various chart types.
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d3.js - Data-Driven Documents
Small and very flexible open-source JavaScript library for manipulating documents based on data (e.g. to generate HTML5 or SVG charts from data).
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Google Public Data Explorer
Online public dataset directory and tool to publish and visualize large datasets.
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Maps Marker WP-Plugin
Wordpress plugin for showing maps annotated with places of interest in a Wordpress blog.
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DataMaps.eu - map your data
Tool for the creation of appealing map visualizations, which can be created within the website without programming knowledge.
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Ushahidi
Open source software for information collection, visualization and interactive mapping of location-based realtime data (e.g. from emergency situations, political elections, ...).