ITK/Release 4/Modularization/Add an external module (external module)

An External Module is distributed outside the ITK main repository, but it could be built into ITK as a module once downloaded into the local copy of ITK source tree.

The organization of an External Module should be the same as an Internal Module: Add a module (Internal Module)

To build an External Module, users download it into a local copy of ITK source tree under: ITK/Modules/External/. Then simply rerun the CMake step to configure the new External Module together with other enabled ITK modules.

An example is demonstrated in the Lesion Sizing Toolkit: Lesion Sizing Toolkit Wiki

Once you have your External Module, you can make it available as a Remote Module So it has broader exposure to the ITK community.