Mac: It's easy to let the amount of Mac apps you have open at any given time spin out of control. Quitter's an app from Instapaper developer Marco Arment that'll quit or hide any app you want after a period of inactivity.
If you find yourself wasting too much time on
certain apps, say Twitter or Slack, then Quitter's an app that can take
away the temptation to check in every few minutes. If you don't open an
app for a select amount of time, Quitter will hide or quit that app so
you don't think about it. The out of sight, out of mind principle
doesn't necessarily work for everyone, but if you find yourself wasting
time with certain apps just because they're open, this might help you