pyroh

There's physlock[0] as well, as vlock (apparently) has some limitations according to physlock(1):

       physlock  is  an alternative to vlock, it is equivalent to `vlock -an'.
       It is written because vlock blocks some linux  kernel  mechanisms  like
       hibernate  and suspend and can therefore only be used with some limita‐
       tions.

[0] http://github.com/muennich/physlock

There's libbsd for Linux, although I can't comment on the quality of its implementation.

Perhaps try #openbsd on Freenode.

It's optional, off by default, and is anonymized (apparently).