FMEasySync - Link to Free Sync Software
I know that several users have asked about sample sync files. I found this website with a free sync program. This version does require filemaker server 13 to host the database and filemaker pro 13 to make changes to the file. The program uses new features of 13. You are free to modify, so you may be able to convert to a sync program that will work without filemaker server.
Also note the user login information is in the readme.txt file. I missed the first time I view, because I view with notepad and everything ran together, so it better to use some thing like word pad.