The Heirloom Project provides standard Unix utilities.
CSSC is a clone of the Unix SCCS tool suite. CSSC is useful for working with existing source respositories that are already in SCCS format.
Script to migrate SCCS repositories to an existing Subversion repository. Runs from the shell, only requires that you have SCCS and Subversion installed. Keeps your revision history and comments. Quick and simple to use.