Some players display, or play files, in the order that the file was originally copied to a USB drive or stick. YAFS (Yet Another FAT Sorter) allows the order to be changed to whatever you prefer. YAFS is a multi-platform, open source, freeware, command line utility with a GUI (Graphical User Interface).
This software simultaneously displays instantaneous peaks, VU, PPM, CBS Technology Center loudness, and ITU BS.1770 loudness. All meters include peak-hold functionality that makes the peak indications of the meters easy to see.
The software accepts two-channel stereo inputs. The VU and PPM meters are split to indicate the left and right channels. The PPM meter also displays the instantaneous peak values of the L and R digital samples. ~ Hydrogen Audio
The AcousticBrainz project aims to crowd source acoustic information for all music in the world and to make it available to the public. This acoustic information describes the acoustic characteristics of music and includes low-level spectral information and information for genres, moods, keys, scales and much more. The goal of AcousticBrainz is to provide music technology researchers and open source hackers with a massive database of information about music. ~ AcousticBrainz
Mp3tag is a powerful and easy-to-use tool used to edit the metadata of audio files. It supports batch tag-editing of ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE tags for multiple files at once, covering a variety of audio formats.
Furthermore, it supports online database lookups from Amazon, Discogs, MusicBrainz or freedb allowing you to automatically gather proper tags and download cover art for your music library.
You can rename files based on tag information, replace characters or words in tags and filenames, import / export tag information, create playlists and more.