Barrier

Use one keyboard and mouse to control multiple computers across a local network with Barrier, moving the pointer between their screens instead of reaching for separate input devices. It reproduces the central function of a KVM switch in software: moving the pointer to a screen edge changes the controlled computer, while a keypress can switch focus directly.

Barrier runs on Linux and is intended for setups combining Windows, macOS, Linux, and FreeBSD systems, with attention also directed toward future Wayland compatibility. It can connect one controlling machine to another computer or several others, making it useful for multi-system workstations, testing environments, and desks with separate machines.

The project is aimed at people who want a straightforward way to share input while keeping each computer’s display and applications separate. Its open-source code, version 2.4.0-5.15-23.08, reflects a project that prioritizes practical reliability and fixes developed from real user problems.

Barrier was forked from Symless’s Synergy 1.9 codebase, while Synergy itself was a commercial reimplementation of the original CosmoSynergy by Chris Schoeneman. It distinguishes itself by retaining the simpler goals associated with the earlier software rather than expanding beyond them. Development is conducted openly, with an issue tracker where users can compare problems, contribute details, and follow their resolution.