SAOImageDS9 is an astronomical imaging and data visualization application. DS9
is a stand-alone application which supports FITS images and binary tables,
multiple frame buffers, region manipulation, and many scale algorithms and
colormaps.  DS9 supports a consistent set of GUI and functional capabilities,
as well as advanced features such as 2-D, 3-D and RGB frame buffers, mosaic
images, tiling, blinking, geometric markers, colormap manipulation, scaling,
arbitrary zoom, cropping, rotation, pan, and a variety of coordinate systems.
The GUI for DS9 is user configurable. GUI elements such as the coordinate
display, panner, magnifier, horizontal and vertical graphs, button bar, and
color bar can be configured via menus or the command line.