USB Raptor - Lock and unlock your computer using USB flash drives as keys.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
VSUsbLogon - Free software for Windows, Encryption Software for Windows, Video Downloaders, Login to Windows via USB device, Logon Screen Customization
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Near Lock - A new way to lock your Mac. Just walk away.
OwnTracks - Cross-platform location sharing