Lockitron Bolt - Unlock your door with your phone for only $99
Near Lock - A new way to lock your Mac. Just walk away.
Job Collections by BetaList - Find a startup job you’ll love
USB Raptor - Lock and unlock your computer using USB flash drives as keys.
Lock Smart - Keyless security lock
VSUsbLogon - Free software for Windows, Encryption Software for Windows, Video Downloaders, Login to Windows via USB device, Logon Screen Customization