JGraphT is a Java graph library that provides mathematical graph-theory objects and algorithms. It includes directed, undirected, weighted, unweighted etc. Graphs could be created based on Strings, URLs, XML documents. 

jGraphT - Java graph library

XChart is a light-weight and convenient library for plotting data designed to go from data to chart in the least amount of time possible and to take the guess-work out of customizing the chart style.
<ul>
<li>No required additional dependencies</li>
<li>~182KB Jar</li>
<li>Multiple Y-Axis charts</li>
<li>Line charts</li>
<li>Scatter charts</li>
<li>Area charts</li>
<li>Bar charts</li>
<li>Histogram charts</li>
<li>Pie charts</li>
<li>Donut charts</li>
<li>Bubble charts</li>
<li>Stick charts</li>
<li>Dial charts</li>
<li>Radar charts</li>
<li>OHLC charts</li>
<li>Error bars</li>
<li>Logarithmic axes</li>
<li>Number, Date and Category X-Axis</li>
<li>Multiple series</li>
<li>Tool tips</li>
<li>Extensive customization</li>
<li>Themes – XChart, GGPlot2, MATLAB</li>
<li>Right-click, Save-As…</li>
<li>User-defined axes range</li>
<li>Definable legend placement</li>
<li>CSV import and export</li>
<li>High resolution chart export</li>
<li>Export as PNG, JPG, BMP and GIF</li>
<li>Export SVG, EPS and PDF using optional de.erichseifert.vectorgraphics2d library</li>
<li>Real-time charts</li>
<li>Java 6 and up</li>
</ul>

XChart is a light-weight and convenient library for plotting data designed to go from data to chart in the least amount of time possible and to take the guess-work out of customizing the chart style.

XChart - Light weight Java library for plotting data

GRAL is a Java library for displaying graphs, diagrams, and charts. CSV, bitmap image data, audio file data could be used as data source. The generated graphs could be extracted to various file formats like bitmap, PNG, GIF, JPEG, EPS, PDF, SVG.

GRAL - GRAphing Library

JUNG is a software library that provides a common and extensible language for the modeling, analysis, and visualization of data that can be represented as a graph or network. Its basis in Java allows JUNG-based applications to make use of the extensive built-in capabilities of the Java API, as well as those of other existing third-party Java libraries.

JUNG: Java Universal Network/Graph Framework


Chart2d library provides support to generate two dimensional charts. Pie, Line, Bar, Scatter Plot chart types are supported. It supports both integer and real datasets and label formatting, both positive and negative.

Chart2d - Generate two-dimensional charts using Java

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jGraphT - Java graph library

XChart - Light weight Java library for plotting data

GRAL - GRAphing Library

JUNG: Java Universal Network/Graph Framework

Chart2d - Generate two-dimensional charts using Java

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jGraphT - Java graph library

XChart - Light weight Java library for plotting data

GRAL - GRAphing Library

JUNG: Java Universal Network/Graph Framework

Chart2d - Generate two-dimensional charts using Java

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