“Mp3tag is a powerful and yet easy-to-use tool to edit metadata (ID3, Vorbis Comments and APE) of common audio formats.”
I love two of its features most:
1. batch edit tag info
Just add the album songs into Mp3Tag then edit as whatever you want. very awesome.
2. get album art from online database like amazon.
since this feature highly depend on your orginal mp3’s orginal tag info which most likely are very few sometimes even wrong, I for now still use google image search to get the picture for the album manually, then set it with the above feature.
Of course, Mp3Tag is free. I love freeware
And sure you can donate to them if you could.