unclutter - 8-25+nmu1 main

unclutter hides your X mouse cursor when you don't need it, to prevent it
from getting in the way. You have only to move the mouse to restore the
mouse cursor.
.
This is the original unclutter implementation from the 90s which
works well with classic X11 programs. For a more modern
implementation which works better with some more modern applications
and UI libraries, see unclutter-xfixes.