- Better Touch Tool not free, but worth every penny. Pretty awesome window snapping/arrangement capabilties, and lets you create keyboard/mouse/touchpad/touchbar/just about every other thing you can think of macros.
- Day-O a slightly improved calendar for the top menu bar.
- Objective-See Utilities decent malware guards that don't bog down your system
- Choosy also not free, but if you have more than one browser or if you plan to juggle multiple browser profiles on a work machine, this can be configured to do things like "always open twitter in my personal profile" and "always open mycompany.com in the work profile"
- AltTab an improved window switcher with some decent customizability
- Keka handles 7zip, rar, and some other archive formats that