|This article relies on references to primary sources. (September 2007)|
OpenThesaurus is an open source thesaurus project whose data is available under the GNU Lesser General Public License. It can be used directly online and with a free account users that are logged in can also add and alter entries. All entries have to be checked at least once before a release is made. Apart from that the data is also available in formats for use with the word processors of the office suite OpenOffice.org (Writer) or of KOffice (KWord). Since version 2.0.3 OpenOffice.org innately ships with OpenThesaurus.
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