VisIt

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Image of Rayleigh–Taylor instability, as Visualized by VisIt
Developer(s)	Lawrence Livermore National Laboratory
Stable release	3.2.2[1] / Jan, 2022[2]
Written in	C, C++
Operating system	Unix/Linux, Mac OS X, Microsoft Windows
Type	Scientific visualization, Interactive visualization
License	BSD
Website	[1]

VisIt is an open-source, interactive parallel visualization, and graphical analysis tool designed for viewing scientific data. It can visualize scalar and vector fields on 2D and 3D structured and unstructured meshes.