CodeWeavers CrossOver - Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Cautoh - Turn your phone into a breathalyzer
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Truck - A faster alternative to FTP
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.