https://itg.beckman.illinois.edu/technology_development/software_development/viewit/%|%ViewIt%|% was designed as a 3D image processing program, but turned out to be a general-purpose multidimensional array processor.  It was originally developed to handle data from magnetic resonance imaging. Some features of Viewit include:


   *     Projection reconstruction algorithms for MRI data
   *     Multidimensional Fourier transforms
   *     Convolution operators for image smoothing and enhancement
   *     Simple volume rendering functionality

It is packaged as a custom Tcl shell extension.

ViewIt can be considered as a reverse polish notation calculator
for multidimensional and multivariate arrays. ViewIt was
conceived as software tool similar to a Hewlett Packard calculator
with extra "buttons", or functions for signal processing, image
processing, multivariate analysis and scientific visualtization.
Similar to an RPN calculator, ViewIt relies on a stack of 4 registers
for manipulation of data. However, ViewIt's registers can hold
large multidimensional arrays instead of just scaler values
as with most RPN calculators. ViewIt supports a number of 
file formats for importing and exporting data to the register
stack. A number of raster display devices and network
frame buffer protocols are also supported for display of
data within the register stack.

Latest release at: [http://ami.scripps.edu/redmine/projects/ami/wiki/Viewit]

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