The 1.0 version of GateKeeper for Mac is available as a free download on our website. The software relates to System Tools. This free software for Mac OS X is a product of Untethered Labs, LLC.
From the developer:
The GateKeeper is a lock and Key system for your computer.
You may want to check out more Mac applications, such as Tutor for OS X Mountain Lion, Radiologik DJ or DeepSleep, which might be related to GateKeeper.