Workrave - Workrave is a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI).
USB Raptor - Lock and unlock your computer using USB flash drives as keys.
stretchly - break time reminder app
VSUsbLogon - Free software for Windows, Encryption Software for Windows, Video Downloaders, Login to Windows via USB device, Logon Screen Customization
StretchMinder - Work break timer with guided movement & breathing exercises
Near Lock - A new way to lock your Mac. Just walk away.