Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
DejaGnu - DejaGnu is a framework for testing other programs.
Stigma - A daily journal to be happier and more self-aware
Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...
Fabric - The story of your life that writes itself
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.