I have motivated the development of an OpenBSD port of s3sync, intended to be suitable for the OpenBSD ports repository.
I've attached the port to this message.
I submitted this to
ports@openbsd.org, but it hasn't been accepted/committed yet, how this might actually happen is a bit of a mystery to me. I've tested this port on OpenBSD 4.3 (stable).
In any case, I would certainly appreciate people testing this port, and letting me know if there are any issues.
Don