DejaGnu - DejaGnu is a framework for testing other programs.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.