LeakFinder

This product assists in locating memory leaks. It uses patterns we, at Digital Creations, often employ for fixing memory leaks. It provides a way to get a "controlled" refcount and the traceback of class instance creation.

http://zope.org/Members/hathawsh/LeakFinder

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The product has not been updated recently; you need to patch line 188 to make it work with Zope 2.6 and up:

 > :-) The RefCounts view in the LeakFinder object fails with the following
 > traceback:
 > 
 > Traceback (innermost last):
 >   [...]
 >   Module DocumentTemplate.DT_Util, line 201, in eval
 >    - __traceback_info__: REQUEST
 >   Module <string>, line 0, in ?
 >   Module Products.LeakFinder.LeakFinder, line 240, in manage_getSample
 >   Module Products.LeakFinder.LeakFinder, line 163, in getControlledRefcounts
 >   Module Products.LeakFinder.LeakFinder, line 188, in resetCache
 > TypeError: function takes at most 2 arguments (3 given)
 > ...
 >             c._cache = PickleCache(c, cache.cache_size, cache.cache_age)

 "PickleCache" now has dropped the "cache_age" parameter.
 Try: "PickleCache(c,cache.cache_size)"