grav(6x) on Linux
The text a2b61cc28c90, as Debian 7 (Wheezy) shipped it.
draws a simple orbital simulation
Flags it lists
-
-count -
-decay -
-fps -
-install -
-mono -
-ncolors -
-no-decay -
-no-trail -
-root -
-trail -
-visual -
-window