Xgraph is the name of at least two applications for 2-D interactive plotting, graphing and animation.
In 1984,[1] Carl Hein of Lockheed Martin Advanced Technology Labs developed XGRAPH.
Hein's XGRAPH is available in binary format for various platforms.
In 1989,[2] David Harrison of the University of California, Berkeley, released xgraph for X11R3 of X Window.
Various versions of Harrison's xgraph are available in source and binary format for various platforms.