grav(1) on Linux
The text 99f10af9f44f, as Debian 2.0 (Hamm) shipped it.
draws a simple orbital simulation
Flags it lists
-
-count -
-decay -
-install -
-mono -
-ncolors -
-no-ecay -
-no-trail -
-root -
-trail -
-visual -
-window