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jFreeChart is a widely used open source charting library. Its flexible design is easy to extend and targets both server-side and client-side applications. It supports many output types, including Swing components, image files (PNG and JPEG) and vector graphics file formats (including PDF, EPS and SVG).
Rickshaw provides the elements you need to create interactive graphs: renderers, legends, hovers, range selectors etc. It's all based on d3 underneath, so graphs are drawn with standard SVG and styled with CSS.
LiveGraph is a framework for real-time data visualisation, analysis and logging. It has a real time plotter that can automatically update graphs of your data while it is still being computed by your application. LiveGraph reads files in a simple CSV-style format. For applications developed in Java, LiveGraph additionally provides an API that handles all data logging and persistency issues.
Charts4j is a lightweight charts & graphs Java API. It enables developers to pro grammatically create the charts available in the Google Chart API through a straightforward and intuitive Java API. It Supports nearly all features of the Google Chart API. It hides the ugly details of creating the URL parameters that are necessary for communicating with the Google Chart API.
KOffice consists of several applications that offer a specialized interface for a certain task to a generic set of content components. Its office suite includes word processing, spreadsheets, presentations, graphics, databases, project planning.
BIRT is an Eclipse-based open source reporting system for web applications, especially those based on Java and J2EE. BIRT has two main components: a report designer based on Eclipse, and a runtime component that you can add to your app server. BIRT also offers a charting engine that lets you add charts to your own application.