What is your favorite automation tool? (ex: Zapier)

We hosted public online zapier hackathon. It was a fun - discussion automation idea with 10-20 people in Zoom and publicly build automation Zaps. https://www.meetup.com/Machine-Learning-Meetup-by-team-ai/events/270563000/ - what is your favorite tool? i know zapier, ifttt, integromat, parabola, google app script, slack workflow (chatops)