Download of ZoneBreaker 1.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Productivity Tools, more precisely Timekeeping. This Mac app was originally developed by Bech LLC. We recommend checking the downloaded files with any free antivirus.
From the developer:
ZoneBreaker helps you realize when important meetings and other events are coming up by smoothly flashing your screen at a set interval before the event starts, giving you time to grab your headset or walk to the meeting room. This app will read your system Calendar and basing on a set of rules, you create it will automatically create reminders for your upcoming events.
You may want to check out more software for Mac, such as GeburtstagsChecker, QuickNote or HourGuard Time Sheet, which might be related to ZoneBreaker.