throttle removed from FreeBSD ports - alternatives?

Hi all, I am using "throttle" for snapshot backups. It is a small utility reading from stdin and writing to stdout and used to limit the speed (to avoid "hammering" of disks and networks) E.g. "throttle -1M" reads 1 MByte/sec. Unfortunately this utility was removed from the FreeBSD ports. I do not know the background. It is nowhere maintained anymore, it seems (if I get the change log right, it was part of a "bulk retirement commit" in FreeBSD) I am exploring and considering options.. Do you know any alternatives? Regards Peter