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

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

KeyCastr, an open-source keystroke visualizer

Send User Notifications on macOS from the command-line.

OS X menubar status indicator

A Mac PrefPane to manage all your Homebrew-installed services

Programmers' editor for OS X [DEAD PROJECT]

Notational Velocity: modeless, mouseless Mac OS X note-taking application

Experimental fork of Pieter's nice git GUI for OS X. Includes: sidebar, fetch, pull, push, add remote, merge, cherry-pick, rebase, clone, clone to. Mac OS X 10.5+ (see wiki for screenshot)

Time management for your Mac

TextMate plugin (Cocoa) shell for running 'ack'

Small mac application that fixes broken bluetooth headset control by listening for events and sending them directly to apps

Take a screenshot (in OS X) — paste the URL somewhere a second later

Source code for MultiFirefox

Interactive Visualization of Last.fm Listening Histories and Personal Streams