Fido - The safest and most minimalistic smart lock
Near Lock - A new way to lock your Mac. Just walk away.
Otto - Otto is a full-service advertising, web development, and public relations agency.
USB Raptor - Lock and unlock your computer using USB flash drives as keys.
Lockitron Bolt - Unlock your door with your phone for only $99
VSUsbLogon - Free software for Windows, Encryption Software for Windows, Video Downloaders, Login to Windows via USB device, Logon Screen Customization