I’ve moved my UNIXCrypt REALbasic module onto Google Code in a project called rbunixcrypt.
If you’re looking for an open source (MIT licensed) module that enables verification of UNIX crypt style passwords, please check out the rbunixcrypt project.
There’s a download available of the latest version, and as with most Google Code projects you can check out the source with Subversion.
There’s also a discussion group and read-only commit log list hosted on Google Groups too.