The 2.3 version of RemotelessHelper for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely Device Assistants. 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. This free Mac app was originally created by Remoteless.
From the developer:
Use your iPhone or iPad to control Spotify from anywhere in your house, office, restaurant, shop or bar. The possibilities are endless. Works for both Windows and Mac users.No need for Spotify Premium. Built for both iPad and iPhone.To connect to a computer running Spotify trough a firewall etc. choose “Setup manual connection” at the botton of the “New Connection” screen.
You may want to check out more software for Mac, such as goSerial, Xilisoft iPhone Transfer or tn5250, which might be similar to RemotelessHelper.