Bluetooth File Exchange
- Makes it easy to share files between your Mac and Bluetooth-enabled devices.
AirPort Utility
- Note: Most recent release available only within OS X 10.11 El Capitan update.
Activity Monitor
- Displays information about all the processes running on your Mac.
iKey
- iKey allows creation of shortcuts that perform an action or sequence of actions each of which can be launched by key combinations or menu or event.