Entagged is a Java audio file tagger which uses the freedb online database for the retrieval of the tags. It supports custom file renaming based on the tags (with any directory stucture), as well as custom tagging based on the file names. MP3, Ogg, and FLAC are currently supported.
Mixxx is software for DJs that provides everything needed to create live mixes. It allows you to beatmatch songs and crossfade them together, like you would with turntables and a mixer. It runs without any extra hardware, and offers a wide range of advanced features including comprehensive MIDI controller and vinyl control support. To obtain the lowest latency and highest responsiveness, it uses hardware video acceleration and takes advantage of multi-core CPUs.
mod_musicindex is an Apache module aimed at being a C alternative to the Perl module Apache::MP3. It allows nice displaying of directories containing MP3, Ogg Vorbis, FLAC, or MP4/AAC files, including sorting them on various fields, streaming/downloading them, constructing playlists, and searching. It also provides features such as RSS and Podcast feeds, multiple CSS support, and archive downloads.
Network Auralization for Gnutella (N.A.G.) is an interactive software art tool that turns the process of searching for and downloading MP3 files into a chaotic musical collage. It searches for MP3 files that match keywords on the Gnutella network, and downloads and remixes them in real time based on the structure of the Gnutella network itself. It was commissioned by New Radio and Performing Arts, Inc. and was made possible with funding from the National Endowment for the Arts.
FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications. It can read MIDI events from MIDI input devices or files and render them to an audio device using SoundFont instrument banks. It can also play MIDI files. Other features include real time effect control and a powerful API for embedding FluidSynth in other programs.
Q-Audio is a digital audio interface for Q. The package contains three modules which together provide the basic functionality needed to write digital audio applications. The audio module implements a (nearly) real-time audio interface on top of the PortAudio library. The sndfile module allows you to access sound files in various formats using libsndfile. The wave module provides basic operations for creating and manipulating wave data, including operations to convert sample rates, to calculate Fourier transforms, and to display wave data in a GGI visual.