Flare is a collection of ActionScript 3 classes for building a wide variety of interactive visualizations. For example, flare can be used to build basic charts, complex animations, network diagrams, treemaps, and more. Flare is written in the ActionScript 3 programming language and can be used to build visualizations that run on the web in the Adobe Flash Player. Flare applications can be built using the free Adobe Flex SDK or Adobe's Flex Builder IDE. Flare is based on prefuse, a full-featured visualization toolkit written in Java. Flare is open source software licensed under the terms of the BSD license, and can be freely used for both commercial and non-commercial purposes.