xbanish hides the mouse cursor when you start typing, and shows it again when
the mouse cursor moves or a mouse button is pressed. This is similar to
xterm's pointerMode setting, but xbanish works globally in the X11 session.

unclutter's -keystroke mode is supposed to do this, but it's broken[0]. I
looked into fixing it, but the unclutter source code is terrible, so I wrote
xbanish in a few hours.

The name comes from ratpoison's "banish" command that sends the cursor to the
corner of the screen.

0. https://bugs.launchpad.net/ubuntu/+source/unclutter/+bug/54148