Does FreeBSD have a present/working/sane system to set per-user(or per-group) resource limits, including number of processes, file descriptors, physical RAM usage, etc, that would count all processes, and not apply to each process individually? Has anyone used it successfully?

The Linux kernel doesn't appear to have this functionality, which is...very annoying. It would be nice to find a Linux kernel patch that does this, but I can't find one that's remotely current.