Pretty much any of the tagging software out there will help you tag them. I use Tag&Rename on the windows side and Tag Editor for my tagging needs. You can also use XLD for tagging.
Tag Editor and XLD are on the Mac. I didn't know if you were on a Mac or Windows Machine. I actually installed a version of Windows on my Mac for the sole purpose of using Tag&Rename. However I found I have been using Tag Editor a lot more lately. Most of the time, when I rip, I try and get the tags right the first time so I don't have to go back and re-tag a lot of stuff. I know this isn't the case with files acquired from other sources.
XLD is actually transcoder but a by product is it does tagging also.
I just found out you can do it with Audacity as well. The respectable free open source multi-platform audio editor. Have to admit: it must re-save the whole file for tags to be applied, so won't work for MP3's I think.