ManageEngine RecoveryManager Plus - RecoveryManager Plus is one such enterprise backup solution which has the ability to easily backup and restores both the domain controllers and virtual machines.
Hunter - Find all the email addresses related to a domain
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
Lead Finder - Find any email from a company in seconds. free
SECDO - SECDO offers automated endpoint security and incident response solutions
AnyMailFinder.com - Find anyone's email address