SynergyKM has been discontinued. Similar apps include Mouse without Borders, which is free. Other options are Multiplicity, Input Director, ShareMouse and x2vnc (win2vnc). In total there are eight Mouse Sharing Utilities like SynergyKM for Windows, Linux, Mac and Android.
Control multiple PCs effortlessly with a single mouse and keyboard, drag-and-drop files between machines, and customize your screens with Bing images, all without extra gear.
Multiplicity offers a virtual KVM solution, managing several computers with one keyboard and mouse. Its remote modes enable cursor transition across monitors and centralized control. Users can transfer files, stream audio, and lock computers without extra hardware, suitable for command rooms, IT desks, and home users.
United States
Input Director is a Windows application that lets you control multiple Windows systems using the keyboard/mouse attached to one computer. It is designed for folks who have two (or more) computers set up at home and find themselves regularly sliding from one system to the other.
Australia
Seamlessly control multiple computers using one mouse and keyboard, switch between systems by moving the pointer, transmit input securely over LAN, share clipboard, support drag-and-drop files, and work across Windows or macOS with no hardware required.
Germany
EU
This program will let you use two screens on two different computers as if they were connected to the same computer.
United States
This program will let you use two screens on two different computers as if they were connected to the same computer. It even works between different operating systems.
Mouse Broadcaster is used to duplicate mouse and keyboard actions to multiple PCs on a network.
