Springtomize - Tear down the walls
BlueLife KeyFreeze - FREE Windows application that blocks your keyboard and mouse without “locking” the screen.
GO Locker - GO Locker,design to GO Launcher EX is the most simple locker for Android!
Transparent Screen Lock - Password protect your workstation or server with "Transparent Screen Lock" while monitoring programs that are running.
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
ClearLock - A transparent screen locker.