MediaMonkey is one cool application. It’s worth it for the Auto-Tag from Filename tool.

Features:

  • Organize music and edit tags in your audio library with a powerful, intuitive interface
  • Automatically lookup and tag Album Art and other metadata
  • Manage 50,000+ files in your music collection without bogging down
  • Play MP3s and other audio formats, and never again worry about varying volume
  • Record CDs into OGG, MP3, FLAC and WMA files
  • Convert MP3s, OGG, FLAC and WMA files into other formats with the Audio Converter
  • Create playlists and music mixes quickly and easily to suit any occasion
  • Synchronize with iPods / MP3 players effortlessly and convert tracks on-the-fly

Link:
http://www.mediamonkey.com/

Check out these posts too:

  1. Another free audio converter
  2. Media Convert – Convert and split sound, ringtones, images, docs
  3. Normalize the audio of your MP3 collection
  4. If not Winamp then try foobar2000
  5. Free WMA to MP3 Converter
  6. Howto: Stream Your Music Online
  7. A couple of free movie converters