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
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.
Knocker.io - Automate searching for small businesses without a website around the world
Dolphin File Manager - Dolphin is a file manager for KDE focusing on usability.