For a start it include PrecoSat, from http://fmv.jku.at/precosat/ and Minisat v2, from http://minisat.se/, but more backends can easily be added.
CL-SATWRAP is available under LLGPL at http://repo.or.cz/w/cl-satwrap.git.
See also cl-cudd.
This page is linked from: cl-cudd
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