Gephi main source code is distributed under the dual license CDDL 1.0 and GNU General Public License v3. Read the License FAQs to learn more.

Gephi includes third-party components which are under different licenses:

Name License Third Party Code In latest version of Gephi?
NetBeans Platform 7.0 GNU GPL v2 http://netbeans.org Yes, part of 0.8
Apache Commons Codec Apache 2.0 http://commons.apache.org/codec Yes, part of 0.7
Batik 1.7 Apache 2.0 http://xmlgraphics.apache.or/batik/ Yes, part of 0.7
ColorChooser CDDL+GPLv2 CE https://colorchooser.dev.java.net Yes, part of 0.7
ColorPicker BSD http://javagraphics.java.net Yes, part of 0.8
Commons Compress Apache 2.0 http://commons.apache.org/compress Yes, part of 0.8
Flamingo BSD https://flamingo.dev.java.net Yes, part of 0.7
FontChooser LGPL http://www.connectina.com/components Yes, part of 0.7
Gleem LGPL http://www.gnu.org/software/gleem/ Yes, part of 0.7
Google Collections Apache 2.0 http://google-collections.googlecode.com Yes, part of 0.7
iText PDF AGPL http://itextpdf.com Yes, part of 0.7
JavaCSV LGPL http://sourceforge.net/projects/javacsv/ Yes, part of 0.7
JCalendar LGPLv2 http://www.toedter.com/en/jcalendar/ Yes, part of 0.8
JFreeChart LGPL http://www.jfree.org/jfreechart/ Yes, part of 0.7
JODA Apache 2.0 http://joda-time.sourceforge.net Yes, part of 0.7
JOGL 1.1 BSD http://kenai.com/projects/jogl/ Yes, part of 0.7
Looks BSD http://www.jgoodies.com/freeware/looks/ Yes, part of 0.8
MigLayout BSD http://www.miglayout.com Yes, part of 0.7
MySQL Driver GPL http://mysql.com Yes, part of 0.7
PostgreSQL Driver BSD http://jdbc.postgresql.org Yes, part of 0.7
Processing LGPL http://processing.org Yes, part of 0.7
Simple Validation CDDL+GPLv2 CE http://kenai.com/projects/simplevalidation Yes, part of 0.7
Sparklines Apache 2.0 http://www.representqueens.com/spark/ No, not part of 0.8beta
SQLServer Driver ? http://microsoft.com Yes, part of 0.7
StaxUtils BSD https://stax-utils.dev.java.net Yes, part of 0.7
SwingX LGPL https://swingx.dev.java.net Yes, part of 0.7
TimingFramework BSD https://timingframework.dev.java.net Yes, part of 0.7
Fugue Icons CC 3.0 BY http://code.google.com/p/fugue-icons-src/ Yes, part of 0.7
Famfam Icons CC 3.0 BY http://www.famfamfam.com Yes, part of 0.7

More detailed table on the wiki.