Please find the attached Windows RT native binaries for Synergy (v1.3.8 stable). See the project homepage for more details:
Haven't found any issues so far with Synergy, however you must run 'launcher.exe' as Admin or some of the functionality won't work correctly (namely key strokes) . I have binaries for the latest beta version as well but only for the command line tools without a GUI - PM me if you'd like those instead but this one should suit everyone fine.
EDIT: I've added the binaries (and QT4 runtime) for Synergy 1.4.12 Beta. I personally don't like this version as much (more heavy weight and takes more effort to configure) but others have asked for it.. and it was a good test of the QT4 runtime port. Please don't ask me how to configure it, there is plenty of information on the synergy website on sorting out configuration issues.