Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
DejaGnu - DejaGnu is a framework for testing other programs.
Tatsu - Standup meetings for remote teams.
Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...
Flock - A faster way for your team to communicate
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.