[anotheryou]

https://symless.com/synergy (there is also an old freeware version floating around if you google a bit)

Used to be the first thing I installed when setting up another computer.

[btschaegg]

I can second this recommendation. I don't use it much nowadays, but it's done good work for me in the past, and I've gladly paid them the 20$ for a Pro license.

I have to say that they haven't grasped the whole "open source on GitHub" thing yet though. It took me over a year to get a PR accepted that fixed a simple Qt5 #include problem...

[SteveNuts]

Does it have working encryption yet? It's been a while since I've used it, I stopped because at the time you were basically sending all keystrokes in plaintext over the network.

[anotheryou]

Looks like the pro version has. My issue is that it's hooking before autohotkey and my keyboard layout only works nice with ahk.