StageTimer 2.7.7 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. 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. The software is included in Design & Photo Tools. This Mac app is a product of Neodarque.
From the developer:
StageTimer is an application for AV professionals. The program supports your presenters on stage with a countdown. StageTimer can run in fullscreen on external scren, while keeping controls available for operator. You can use multiple timers (i.e count down and timer of day) on the same screen.
You may want to check out more software for Mac, such as Vvidget, S90 ES Mix Editor or Winscape, which might be similar to StageTimer.