MoreAmp is an audio player, transcoder, and CD ripper for Mac OS X, Mac OS 9, Windows, Unix, and Linux. It plays and creates ogg, flac, mp3, aac, m4a, mp4, wav, and aif files, and plays wma files. It features a 31-band equalizer, repeat loop, variable pitch/tempo, ram or ramdisk preload, and more.
The FAAC project includes the AAC encoder FAAC and decoder FAAD2. It supports several MPEG-4 object types (LC, Main, LTP, HE AAC, PS) and file formats (ADTS AAC, raw AAC, MP4), multichannel and gapless en/decoding as well as MP4 metadata tags. The codecs are compatible with standard-compliant audio applications using one or more of these profiles.
KFreeDB is an application for interacting with the FreeDB disc information database. It allows the user to query the database for a disc in a local drive, or submit new entries. It communicates with the FreeDB server via HTTP. It also features support for inexact/multiple matches, and resubmission of entries.
mkat is a set of command line tools for burning and cataloging data CD/DVD/BD and audio CDs. The catalog can later be searched for certain files or an audio CD. Tags can be used to categorize CD/DVD/BDs, e.g. comedy, drama, kids, sports. mkat is configured to use wodim/growisofs and genisoimage to do the real work, but it should be possible to configure it to use arbitrary programs.
Find Duplicate Music Files detects music files that contain the same music, even if the files are differently named, and are in different formats such as MP3, OGG, WAV, WMA, M4A, and RealAudio and contain different or non-existent meta-information such as ID3 tags. The program operates on whole directories of music files, analyzes them, and outputs the filenames of pairs that seem similar, based on their audio fingerprint or perceptual hash.