NetWrix Auditor - Configuration Auditing of IT Infrastructure
MailStore - MailStore Home - A 100% free single-private-user desktop solution
ManageEngine ADAudit - ManageEngine ADAudit is a real-time windows active directory auditing tool.
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X
PingCastle - Because the Active Directory security lies in the process and not in expensive tools, our solution is simple: download PingCastle and apply its methodology.
Gmvault - Backup the emails in your Gmail account.