You could have downloaded StartSender 1.2 for Mac from our software library for free. StartSender for Mac lies within System Tools, more precisely Remote Computing. The actual developer of this free software for Mac is Kaiser and Kaiser.
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, RDM+ Desktop or Remote Activity, which might be similar to StartSender.