empty - empty is an utility that provides an interface to execute and/or interact with processes under...

Habit List - Create good habits and break bad ones with the app that keeps you focused.

Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...

Momentum - Agile goal and performance management

Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX. 

Habitica - Habitica is a free habit building and productivity application.