kavoom

Kavoom! KM is like a hardware keyboard-mouse switch (a KVM switch with no video connected), allowing you to operate two or more computers using a single keyboard and mouse. You transfer control from one computer to another by moving the mouse pointer off the edge of the screen towards the other monitor. Or you can use hot keys to switch back and forth.

New version! -Operate all of your computers from a single keyboard, monitor, and mouse. Kavoom! KVM is like a hardware KVM switch except that the "switch" appears on your monitor, and you use the mouse to select which computer to operate.

Extramon lets you use a second computer as a second monitor, giving you a dual-monitor computer. In fact, both of your computers become dual-monitor computers. And you can operate them both from a single keyboard and mouse. No hardware or cabling needed. All you need is two networked computers sitting side-by-side.