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VTK
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<p>The Visualization Toolkit (VTK) is a <a href="/facts/Free_software/IaoVtJXn">free software</a> system for <a href="/facts/3D_computer_graphics/zlWW6eaF">3D computer graphics</a>, <a href="/facts/Image_processing/zenalNCf">image processing</a> and <a href="/facts/Scientific_visualization/p0yPc1X5">scientific visualization</a>. </p><p>VTK is distributed under the <a href="/facts/GNU_Project/mjc8AwM6">GNU</a>-approved and <a href="/facts/Free_Software_Foundation/k0sBmw7y">FSF</a>-approved <a href="/facts/BSD_licenses/XLtmLp5x">BSD 3-clause License</a>. </p>