wristsavr — forces you to take a break.
wristsavr saves your wrists: it periodically zwrites & xlocks your screen to remind you to take a 2 minute break. This is a little ditty that I whipped up last night to avoid working on my operating system.
usage: wristsavr [-hb] [-m mins]
-h Display usage information.
-b Bully mode. If xlock terminates before two minutes,
xlock the screen again.
-m mins wait mins minutes between wristsavr notices (defualt 45)