What do you use to manage ID3 tags including replay gain?

I’m interested in your thoughts here, what you use.

I use Mac OSX as my primary machine, a QNAP NAS to host my music, and then have Volumio itself. All of these are options to ‘host’ an application. I haven’t really found a nice free web-based tool which is really surprising.

Things I want to do are manage an entire collection and find issues and easily fix them. I don’t need a ‘one button’ solution that updates all my tags to what it considers to be correct, as I have found that the crowd-sourced tags are often wrong. I just want an efficient editor.

Example use cases:

  • Find all songs that don’t have replaygain tags and then give them tags.
  • Find songs in folders that have tags that don’t match where you’d expect they would (album artist + album name).
  • Missing track numbers.
  • Maybe scanning lossless tracks and comparing their hash to a database to find bad rips.
  • An ‘incoming’ folder where you put in a raw new album that may not meet your conventions, then processing it and moving it into its correct folder once the tags are set / corrected and all quality checks have passed.