Jajuk Advanced Jukebox

Jajuk is software that organizes and plays music. It is a full-featured application geared towards advanced users with large or scattered music collections. Using multiple perspectives, the software is designed to be intuitive and provide different visions of your collection.

Jajuk Advanced Jukebox - Official Site - jajuk

Mp3tag

The universal Tag Editor and more

Mp3tag is a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.
It can rename files based on the tag information, replace characters or words in tags and filenames, import/export tag information, create playlists and more.
Mp3tag supports online database lookups from, e.g., Amazon, discogs, or freedb, allowing you to automatically gather proper tags and cover art for your music library.

http://www.mp3tag.de/en/

BPM Counter

BPM Counter is a fast and accurate beats per minute detector for MP3 music. It may be helpful for DJs who need to get information about entire music collection quickly and for any kind of remixing/sampling stuff. Don't waste your time for manual tapping, just navigate to any folder with music and BPM Counter will show all compatible audio files (MP3 and WAV) and start BPM detection automatically. A common mistake with other BPM detectors is they may halve or double the actual BPM rate because decoder MP3 files partialy with lower quality. We use high-quality audio decoders from Audio Converter Plus to guarantee balance between performance and accuracy.

http://www.abyssmedia.com/bpmcounter/