Regshot - Quickly take a snapshot of your registry and then compare it with a second one.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Advanced Registry Tracer - Analyze changes made to the Windows Registry.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
RegistryChangesView - Compare 2 snapshots of Windows Registry, display all changes, and optionally generate .reg file.
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.