The Most Powerful Mac Productivity and Automation Apps

Alfred: A productivity app for Mac OS X, which boosts your efficiency with hotkeys, keywords, text expansion, and more.
BetterTouchTool: Allows you to configure many types of gestures for your Mac’s Trackpad, Magic Mouse, and Keyboard.
Hazel: A system preference pane that works silently in the background, automatically filing, organizing, and cleaning up your desktop.
Automator: A built-in Mac utility for automating tasks. You can create workflows, watch folders, and set up automated actions.
Keyboard Maestro: Enhances the power of your keyboard by creating macros that can automate virtually anything on your Mac.
QuickSilver: A light, fast, and free Mac application launcher that also replaces your task switcher.
Things: Task management software that makes it easy to stay organized and get things done.
Ulysses: A feature-rich text editor for writers that allows you to manage and organize all your writing in a single app.
BetterSnapTool: Allows users to quickly and easily manage their window positions and sizes by either dragging them to one of the screen's corners or to the top, left or right side of the screen.
Bartender: Lets you organize your menu bar apps by hiding them, rearranging them, or moving them to the Bartender Bar.
Magnet: Keeps your workspace organized and allows you to snap application windows in different halves or quarters of your screen.