BitTorrent Sync open source alternnative

BitTorrent Sync open source alternnative

BitTorrent Sync is great. But I wish to use it for my docs and passwords.
BitTorrent was hacked recently
http://forum.ragezone.com/f10/bittorrent-source-dns-reward-948810/
So it is possible that key from my folder leaked.
I wish to have open source alternative. I wish to understand risks and
control all keys myself.