There was recently a Review Request for "synergy" which will substitute the current "synergy-plus" package:
https://bugzilla.redhat.com/show_bug.cgi?id=722843

Since "synergy" was already once in Fedora's package repository, it had to be un-retired. According to https://admin.fedoraproject.org/pkgdb/acls/name/synergy this was only done for F14, F15 and F16, but not for rawhide.

Please un-retire the package in rawhide as well. Owners should be thias and chkr.

Thanks!