The best Mouse Sharing alternative to Spacedesk is Multiplicity. It's not free, so if you're looking for a free alternative, you could try Win2VNC. If that doesn't suit you, our users have ranked more than 25 alternatives to Spacedesk and three of them are Mouse Sharing Utilities so hopefully you can find a suitable replacement.
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.
Turns iOS or Android devices into efficient second displays or graphics tablets for Mac and PC, delivering zero-lag, high-resolution output with touch, gesture, and touch bar support, hardware-free setup, secure remote desktop capabilities, and end-to-end encryption.
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.
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Multiplicity make it possible to use your mouse and keyboard for 2 pc while Spacedesk make a laptop etc. an additional screen for your desktop.