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Remember x2vnc and win2vnc? What can I use now? [possibly solved]
(sh.itjust.works)
A community for everything relating to the GNU/Linux operating system
Also check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
There's also deskhop which is essentially a pure hardware solution similar to Synergy (helpful when you cannot install software on a machine or if they are on different networks). You can build your own or purchase parts/pre-built deskhops from elecrow.
https://github.com/hrvach/deskhop