Download of StartSender 1.2 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 actual developer of this free software for Mac is Kaiser and Kaiser.
The program lies within System Tools, more precisely Remote Computing. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
StartSender be used on a MacBook to remotely start the clock and recording in Photo or Video finish. You set it up in the same way as StartSender on iOS: Just start the app and go into Set Start in Photo finish, choose Start Sender and sync. Use the buttons in the app or the keyboard to send commands.
You may want to check out more software for Mac, such as VOMP, RemoteTapServer or Radmind, which might be similar to StartSender.