Here is a port to get rainbowcrack to natively compile on OpenBSD. Currently I do not allow source or binary distribution because of lack of license in the source file, however I am trying to contact the author to receive a friendly license. I know I would find this port very useful even considering lack of distribution, as it would let me do a lot of stuff at work on OpenBSD that I currently do on Linux. If you aren't familiar with rainbowcrack, the web site is here: http://www.antsight.com/zsl/rainbowcrack/
rainbowcrack.tar.gz
Description: GNU Zip compressed data