Time Out - Break timer with micro-breaks for Mac OS X.
Coworker Coffee - Coffee with a different coworker each week
Breaktime - Break time is an app that reminds you to stand up every chosen amount of time.
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Eyeleo - EyeLeo is a handy PC application that reminds you to take a break for your eyes.
Cuely - 1-min guided exercises to stay well all day with reminders