Some of the tools listed on the web page below may be of interest, particularly numbers 2 and 7.
1) Netwrix Change Notifier for Active Directory: Receive emails detailing changes to Active Directory users, groups and group membership, computers, organizational units and permissions, GPOs, Exchange Server configurations and permissions.
2) Netwrix Change Notifier for File Servers: Know what changes are made to files, folders and permissions, and track newly created and deleted files.
3) Netwrix Change Notifier for VMware: Be notified of changes to VMware host and virtual machine settings, creation and deletion of virtual machines via email.
4) Netwrix Password Manager: Empower users to reset forgotten passwords and unlock their accounts through a Web-based, self-service portal without calling the IT help desk. This free password manager software supports up to 100 users.
5) Netwrix Password Expiration Notifier: Automatically send email notifications to your users letting them know their password is about to expire.
6) Netwrix Account Lockout Examiner: Alert your help desk staff about lockout events and troubleshoot account lockouts, analyzing potential causes. Accounts can be unlocked within the console, a Web-based interface or via a mobile device.
7) Netwrix Disk Space Monitor: Be alerted in real-time via email when disk space falls below certain thresholds on one or more of your servers.
http://www.netwrix.com/top_7_freeware_tools.html