Synergy is described as 'Combines your desktop devices together in to one cohesive experience. It's software for sharing your mouse and keyboard between multiple computers on your desk. It works on Windows, macOS and Linux' and is a very popular Mouse Sharing utility in the os & utilities category. There are more than 10 alternatives to Synergy for a variety of platforms, including Windows, Mac, Linux, BSD and Flathub apps. The best Synergy alternative is Barrier, which is both free and Open Source. Other great apps like Synergy are Mouse without Borders, Input Director, Input Leap and ShareMouse.
Barrier is a cross-platform software utility for sharing your mouse and keyboard between multiple computers on your desk. It was forked from Synergy version 1.9's codebase.
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.
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.
Input Leap is software that mimics the functionality of a KVM switch, which historically would allow you to use a single keyboard and mouse to control multiple computers by physically turning a dial on the box to switch the machine you're controlling at any given moment.
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.
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.
InputShare enables you to share the keyboard and mouse of your computer with an Android device via ADB in wired / wireless way.
Deskflow is a free and open-source keyboard and mouse sharing app. Use the keyboard, mouse, or trackpad of one computer to control nearby computers, and work seamlessly between them. It's like a software KVM (but without the video). TLS encryption is enabled by default.
Cross-platform utility tool for seamless mouse, keyboard and clipboard sharing and usage in multi-display, single and multi-device setups.
GiMeSpace KVMShare Pro is one of the very few real KVM software sollutions that not only shares mouse and keyboard but really allows you to share video in the form of windows on the screen of connected computers while using minimal bandwidth.
This program will let you use two screens on two different computers as if they were connected to the same computer.
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This is the only cross-platform solution I've found so far, and it's working a heck of a lot better than Synergy!