Download of Rigelian 1.7.0 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. We recommend checking the downloaded files with any free antivirus. The software lies within Audio & Video Tools, more precisely Players. The actual developer of this free software for Mac is Katoemba Software.
From the developer:
Rigelian lets you enjoy your mpd or Kodi music library using a fluent and modern controller. This application allows you to browse through your music library quickly so you’ll be listening to your favorite tunes in seconds. You can browse by artist, album, genre, folder, composer, and performer. You can browse and play thousands of radio stations via Shoutcast. You can create, edit, and save playlists with ease.
You may want to check out more Mac applications, such as HALion Player, which might be related to Rigelian.