KMremoteControl lets you use one system's keyboard/mouse to operate all the Macs and PC's on your desk. KMremoteControl supports both Mac OS X and Windows 2000/XP, including cross-platform operation.

Features:

remote controlling another system is quickly activated/deactivated via a "hotkey"

remote controlling another system can be activated/deactivated via "edge-detection"

provides platform-based authentication

secure communications, via SSL, can be used for all communications (Mac-to-Mac)

has a similar interface on both Mac OS X and PC/Windows

setup and operation is easy and operation is capable but understandable

the networking port number can be changed to avoid conflicts

supports the use of "hotkeys" (e.g., application switcher keys) on the system being controlled (note that this is always supported without any extra capabilities on a PC/Windows system)

supports single-button mouse operation when controlling a PC/Windows system by allowing a right-mouse to be sent instead of a control-click

KMremoteControl's windows can be made transparent when controlling or the controlling system's screen can be blackened when controlling

Requirements:
OS X 10.4.x
Only Partial support for 10.5.x

PPC