Latest Official Release
The current release is version 4.0.0 from December 2011. The following downloads are available:

• InsightToolkit-4.0.0.tar.gz (hosted at Sourceforge)
• InsightToolkit-4.0.0.tar.xz (hosted at Sourceforge)
• InsightToolkit-4.0.0.zip (hosted at Sourceforge)
• ITK Software Guide 2.4.0 PDF (hosted at Sourceforge)
• InsightApplications-4.0.0.tar.gz (hosted at SourceForge)
• InsightApplications-4.0.0.zip (hosted at SourceForge)
• DoxygenInsightToolkit-4.0.0.tar.gz (hosted at SourceForge)
• DoxygenInsightToolkit-4.0.0.zip (hosted at SourceForge)
• CableSwig-ITK-4.0.0.tar.gz (hosted at SourceForge)
• CableSwig-ITK-4.0.0.zip (hosted at SourceForge)

Version 3 Series
The version 3 series is no longer under active development, but bug fix maintenance releases are still available.

Release 3.20 (July 12 2010)

• ITK Software Guide 2.4.0 PDF (hosted at SourceForge)
• InsightToolkit-3.20.1.tar.gz (hosted at SourceForge)
• InsightToolkit-3.20.1.zip (hosted at SourceForge)
• InsightApplications-3.20.0.tar.gz (hosted at SourceForge)
• InsightApplications-3.20.0.zip (hosted at SourceForge)
• DoxygenInsightToolkit-3.20.0.tar.gz (hosted at SourceForge)
• DoxygenInsightToolkit-3.20.0.zip (hosted at SourceForge)
• CableSwig-ITK-3.20.0.tar.gz (hosted at SourceForge)
• CableSwig-ITK-3.20.0.zip (hosted at SourceForge)

Legacy Releases
Click here for access to legacy release files

Current Development
Download ITK source via Git: http://www.itk.org/Wiki/ITK/Git

This software may not be exported in violation of any U.S. export laws or regulations.  For more information regarding Export Control matters please go to http://kitware.com/export_control/index.html.