1password if you're not using any other password organizer app. Bartender to keep your menu bar items organized. Flashlight to make Spotlight a bit more power

1password if you're not using any other password organizer app. Bartender to keep your menu bar items organized. Flashlight to make Spotlight a bit more powerful. Flux if you're into it. Github OSX app is quite nice. That's what I got from a quick look to my system.