NSMonitor
NSMonitor displays the stream of CGEvents*, FSEvents, NSWorkspace and Distributed Notifications in real time.
It also monitors Multitouch gestures (taps, swipes, pinches), network usage, sockets, and file usage with their corresponding applications**.
It attempts to be as verbose as possible while consuming minimal system resources.
The individual lists can be filtered instantly using the search bar, allowing you to find specific events by type or data content.
*with the exception of kCGEventMouseMoved events
**only for files/sockets that have been in use for more than 30 seconds
Legacy version (v1.x) information follows:
Legacy NSMonitor 1.x