Apps similar to Flac-R include foobar2000, which is free for personal use. Other options are Mp3tag, MusicBrainz Picard, TagScanner and Kid3. Mp3 Tag Editors like Flac-R are a crowded field, with more than 50 alternatives for Windows, Mac, Linux, Android and iPhone.
TagJet is a spreadsheet MP3 tag editor that can identify tracks and entire albums and then automatically add to them tags, album art and lyrics. As well as it has wide capabilities of manual editing and ability to make all operation in batch.
ID3 renamer is useful if you need to rename a large number of files in a directory accordingly to their ID3 description and a given "formula" (e.g. (%Track) %Artist - %Title). Such a function is pretty "smart", as it lets you assembly the filename as you wish...
TigoTago is a spreadsheet-based tag editor for media files. Automated tags import from dicogs.com and freedb.org. Full preview changes before saving to disk.
Organize Music.app libraries, find duplicates, compare recordings, inspect audio, convert files, and play local music with live spectrum visuals on Mac.
Bulk ID3 is an en-masse ID3 tag editor. It is designed to allow bulk modification of mp3 files, as well as file renaming.
