There are many alternatives to Barrier for Linux and since it's discontinued a lot of people are looking for a replacement. The best Linux alternative is Input Leap, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Barrier and seven of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Barrier are Synergy, Deskflow, x2vnc (win2vnc) and across.
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.
Synergy 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.
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.
Cross-platform utility tool for seamless mouse, keyboard and clipboard sharing and usage in multi-display, single and multi-device setups.
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Barrier is no longer developed, and Input Leap is an active project based on the same source code