My two cents:

- Alfred (super charged application launcher)

- Dash (API Documentation Browser)

- Karabiner (key remapping)

- Keyboard Maestro (Automation tool)

- SizeUp (window manager)

- iTerm2

- 1Password (Password manager)

Inspiration:

[1] https://works-for-me.github.io/

[2] https://usesthis.com/

[3] https://github.com/nikitavoloboev/my-mac-os