dmalloc: dmalloc.com
ccmalloc: www.inf.ethz.ch/personal/biere/projects/ccmalloc
Insure++: www.parasoft.com/products/insure/index.htm
mpatrol: www.cbmamiga.demon.co.uk/mpatrol
NJAMD: sourceforge.net/projects/njamd
Valgrind: developer.kde.org/~sewardj