Hunter - Find all the email addresses related to a domain
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
AnyMailFinder.com - Find anyone's email address
Dolphin File Manager - Dolphin is a file manager for KDE focusing on usability.
EmailMatcher - Find anyone's email address in a matter of seconds, for free
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.