Overwritten for Mac

From Micah Lanier:

Overwritten uses srm (http://srm.sourceforge.net) to rename and overwrite files repeatedly in order to ensure they cannot be recovered, even through extensive examination. It can easily be used to delete text files that may contain sensitive information such as credit card numbers. Overwritten will not, however, remove the resource fork of a file, so take this into consideration before employing it.