Mouse without Borders is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best open source Linux alternative is Barrier. If that doesn't suit you, our users have ranked more than 10 alternatives to Mouse without Borders and five of them are open source and available for Linux so hopefully you can find a suitable replacement. Other interesting open source Linux alternatives to Mouse without Borders are Input Leap, Deskflow, x2vnc (win2vnc) and Lan Mouse.
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.
Easy to install, setting and is a cross plaform solution.
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.
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.
This program will let you use two screens on two different computers as if they were connected to the same computer.
A remote screen option is not the same as sharing your mouse+keyboard over multiple PCs
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simple, free, crossplatform