puddletag is an audio tag editor (primarily created) for GNU/Linux similar to the Windows program, Mp3tag. Unlike most taggers for GNU/Linux, it uses a spreadsheet-like layout so that all the tags you want to edit by hand are visible and easily editable.
The usual tag editor features are supported like extracting tag information from filenames, renaming files based on their tags by using patterns and basic tag editing.
Then there’re Functions, which can do things like replace text, trim it, do case conversions, etc. Actions can automate repetitive tasks. Doing web lookups using Amazon (including cover art), Discogs (does cover art too!), FreeDB and MusicBrainz is also supported. There’s quite a bit more, but I’ve reached my comma quota.
Supported formats: ID3v1, ID3v2 (mp3), MP4 (mp4, m4a, etc.), VorbisComments (ogg, flac), Musepack (mpc), Monkey’s Audio (.ape) and WavPack (wv).
I worked years using MP3tag (under Windows), but in 2014 i migrated all my media to a PC with Linux. I agree that puddletag is the best tag editor for Linux, but (in my personal opinion) MP3tag has many useful features that puddletag has not (e.g. it is not possible copy/move the selected files to a different path). In addition, puddletag does not remember the last directory used, so you must specify it everytime. Finally the meaning of "T","F","R","I" icons is not very immediate (ie, why not "T-F", "F-T" instead of "T","F"?) It would be great if puddletag will have these features too! Thank you.