iTerm2 is a terminal emulator for Mac OS X that does amazing things.

KeyCastr, an open-source keystroke visualizer

Staggeringly powerful macOS desktop automation with Lua

Spectacle allows you to organize your windows without using a mouse.

LuLu is the free open-source macOS firewall

MacOS system extension that allows applications to pass audio to other applications. Soundflower works on macOS Catalina.

Mac app that shows all open files, directories, sockets, pipes and devices in use by all running processes. Nice GUI for lsof.

A fast and clever hex editor for macOS

Mac Media Keys for the Masses

💻 Ability to rename desktop spaces on macOS 10.10+