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.
KAudioCreator is an audio file creation solution for KDE. Ripping the files using KDE (with CDDB support), it allows you to use whatever encoder you wish to encode your audio files. It also provides a job control system so you can see what files have succeeded or failed, and stop or cancel jobs as the application progresses.
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.
Music Manager is a Konqueror plugin that lets you standardize the filenames of your music files, guess information and set ID3 tags from the file's name (this can be done to several files in one shot), rename many selected files based on their ID3 tags, set ID3 tags in mass for selected files with options for copying ID3s from other files and leaving some ID3 fields untouched, rename _ to space and vice versa, create HTML and text indexes of your collections (including total playing time, etc., configurable through templates), create nice CD covers with full listings of your music files (also configurable through templates), and organize your music collection to create a CD.
SvOlli's Little Audio Related Thingies, or SLART for short, is a compilation of rather simple programs that are related to audio files: it consists of a player (Partyman), a CD ripper, a tag editor, and some other tools. These programs can communicate with each other via a custom IPC bus, so a newly ripped track can be automatically queued in the player, for example.
Wagtail is a client/server-based tool for audio encoding. It is designed to make it easier to encode and organize files in bulk. Wagtail allows you to enforce standards across your media collection with the use of "formats", each describing an audio format, how to encode/tag, etc. It also uses "classes", a combintation of formats and quality settings, as well as "tasks", which set the naming conventions, file locations, and reprocessing stages for files, and restricts which classes can be used. It includes wagdisc for ripping CDs and wagfile for processing files.
Xmcd is a full-featured CD player and ripper software suite including xmcd and cda. Both utilities transform your CD drive into a stereo CD player, allowing you to play music CDs on your computer, as well as perform digital audio extraction (DAE) into files or streams of various formats. Multi-disc CD changers are also supported on many platforms. Xmcd features CDDB disc recognition, web browser integration for content related to the playing CD, local discography management, full feature-specific help system, remote control capability, and more.
YaRET is a Perl script that automates the ripping, normalization, and encoding of CDs. It supports CDDB very well via the Perl Audio::CD module, and also can work with your favorite ripper/normalizer/encoder (e.g., cdparanoia, cdda2wav, normalize, etc.) It supports useful features like multiple concurrent encoders and an easy to use configuration file that lets you customize YaRET to your taste (such as file naming based on the CDDB information).