DS9

SAOImage DS9 is an astronomical imaging and data visualization application. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps. It provides for easy communication with external analysis tasks and is highly configurable and extensible.

To start the application, use the command: ds9
Once started, a Help button provides further information including a reference manual and FAQ's. These can also be accessed at: http://hea-www.harvard.edu/RD/ds9.