AnyMailFinder.com - Find anyone's email address
Workday - Workday is an on‑demand financial management and human capital management software solution.
EmailMatcher - Find anyone's email address in a matter of seconds, for free
UltiPro - UltiPro is another HR application available to use on multiple platforms such as Android and iOS etc.
Hunter - Find all the email addresses related to a domain
Paycom - Paycom is a Human Capital Management system that helps companies manage the complete employment life cycle, from recruitment to retirement.