Apps you can't live without on Mac?

Hey hey!! I want to find some productivity tools to improve my workflow and trying to search for a good clipboard history tool for Mac, have any of you used anything like this? and while we're at it anything else you can't live without? For me, I love using: - ColorSlurp, to be able to copy colours from anywhere - Magnet, to be able to work with sticky windows of all sizes - KeepingYouAwake, which leaves the macbook awake no matter what