LanguageTool is published under the GNU Lesser General Public License (LGPL).
For more detailed license information, see README.txt.

This is the list of libaries used by LanguageTool and their licenses:

jaminid.jar: patched Jaminid 0.99, see jaminid.diff for patch. LGPL.txt, http://jaminid.sourceforge.net/
jdic.jar, subdirectories windows, sunos, linux: LGPL.txt, http://jdic.dev.java.net/
@stempelator.lib@: Morfologik-license.txt, http://morfologik.blogspot.com, http://www.cs.put.poznan.pl/dweiss
jWordSplitter.jar: Apache License 2.0, http://sourceforge.net/projects/jwordsplitter
junit.jar: Common Public License - v 1.0, CPL.txt, http://www.junit.org
