Development

Sonarr is open-source and released under the GPL-3.0 license.  Sonarr has been used as the basis for other apps like Radarr or Lidarr.  Sonarr is made available for Docker through the efforts of LinuxServer.io and their commitment to simplifying self-hosting.

You can learn more about how to contribute to Sonarr through their documentation.  The Sonarr development team also accepts donations.