This is the 2009 edition of:

cnfdd.c - delta debugger for CNFs in DIMACS format
mtcnfdd.c - multithreaded version (needs -pthread to compile)
cnfuzz.c - fuzzer for CNFs in DIMACS format

See our SAT'2010 papers for more details and COPYING for the license.

Armin Biere, April 2010.