IBM's xlC comes with a product called the HeapView debugger that can
trace memory problems in C and C++ code.

SENTINEL has full memory access debugging capabilities including detection 
of memory leaks.  Contact info@vti.com (800) 296-3000 or (703) 430-9247.

Insight from ParaSoft (818) 792-9941.
There is also a debug_malloc posted in one of the comp.sources groups.

A shareware dmalloc is available.  Details at
<http://www.letters.com/dmalloc/>.

TestCenter is now available for the RS/6000.  It supports AIX 3.2.5
and AIX 4.1 on POWER, POWER2 and PowerPC machines.  More information
is available from <http://www.centerline.com/>.

Purify (408) 720-1600 is not availible for the RS/6000.

ZeroFault detects memory violations and leaks without recompiling or
relinking.  Works on all RS/6000 systems running AIX 3.2.5 or later,
DCE and pthreads.  Contact The Kernel Group, Inc. +1 512 433 3333, 
email <ZeroFault@tkg.com>, <http://www.tkg.com/>.

Some parts © 2009 Advameg, Inc.