RSCM - Ruby Source Control Management is to SCM what DBI/JDBC/ODBC
are to databases - an SCM-independent API for accessing a wide
variety of SCMs.

RSCM currently supports CVS and Subversion.  Support for ClearCase,
Darcs, Monotone, Perforce and StarTeam is in progress and partly
available.

WWW: http://rscm.rubyforge.org/