Overlap 2.1.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Moleskine SpA & Bonobo Pte Ltd. The program is included in Productivity Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Overlap helps you find the perfect time to catchup across multiple time zones. It is a smart world clock that magically finds the ideal times where available hours overlap across multiple time zones. With just a swipe, you can smoothly move through time, making it simple and easy to understand what the time will be for any place in the world. Overlap also displays your calendar events, so you can always find a time that suits your schedule.
You may want to check out more Mac applications, such as BlendZ, Hugin or HomeDisk Labels, which might be related to Overlap.