Mouse without Borders is described as 'Control up to four computers from a single mouse and keyboard with no extra hardware. Enjoy seamless file drag-and-drop and login control' and is a very popular Mouse Sharing utility in the os & utilities category. There are more than 10 alternatives to Mouse without Borders for a variety of platforms, including Windows, Mac, Linux, BSD and Flathub apps. The best Mouse without Borders alternative is Synergy. It's not free, so if you're looking for a free alternative, you could try Barrier or Input Director. Other great apps like Mouse without Borders are Input Leap, Multiplicity, ShareMouse and InputShare.
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.
Turn your Mac, Windows, and Linux computers into one seamless workspace with shared keyboard, mouse, clipboard, file transfer, and virtual displays.
This program will let you use two screens on two different computers as if they were connected to the same computer.
The project is no longer developed but the program is still downloadable and working
A remote screen option is not the same as sharing your mouse+keyboard over multiple PCs
An desktop application that makes it easy to share your mouse, keyboard and clipboard between your PC and your Android tablets and phones.
Switchy is a macOS menu bar app that lets you switch an Apple Magic Keyboard, Magic Mouse, and Magic Trackpad between multiple Macs with a single click. It automatically discovers nearby Macs on your local network, so you can move between a work Mac, personal Mac, MacBook, or...
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.
Cross-platform KVM software to share one mouse, keyboard, and clipboard across multiple Windows and macOS computers over your local network.
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I like to use my laptop also as an extra screen for my desktop