Disk Inventory X is a disk usage utility for Mac OS X 10.3 (and later). It shows the sizes of files and folders in a special graphical way called "treemaps". If you've ever wondered where all your disk space has gone, Disk Inventory X will help you to answer this question.
Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app. You can also create and delete (but not edit) events.
f.lux is a cross-platform computer program that adjusts a display's color temperature according to location and time of day, offering functional respite for the eyes. The program is designed to reduce eye strain during night-time use, helping to reduce disruption of sleep patterns.
BetterTouchTool is a great, feature packed app that allows you to customize various input devices on your Mac. Currently BetterTouchTool supports: Macbook Trackpad Magic Trackpad 1 & 2 Magic Mouse 1 & 2 Touch Bar customization Siri/Apple Remote Normal Mouse Gestures Normal Mouse Buttons Keyboard Shortcuts Key Sequences / Text Triggers BTT Remote (iOS) Triggers