Download of DockPlayer 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program lies within Audio & Video Tools, more precisely Players. The actual developer of this software for Mac is Splash Technologies.
From the developer:
Dock is a minimal audio controller for Spotify that places the spotlight on the beautiful artwork associated with the music you love.
A simple blue bar displays the current progress of each track. On hover, you can access basic playback controls like pause/play, next and previous song. Dock requires Spotify's desktop client.
You may want to check out more Mac applications, such as Avid Xpress DV or HALion Player, which might be related to DockPlayer.