BpmDj is a program that can be used by a DJ. It plays MP3 and Ogg files. It has a fully automatic BPM counter. It can determine the sound color. It has a full fledged Qt based interface. It will help you manage a large amount of songs. It can help in creating playlists and has proven to be very robust. The program also allows offline automatic mixing and contains a wavelet based beat graph analyzer to visualize audio tracks.
GSmartMix provides a smart control of the audio on GNOME. There is also an applet which allows manual adjustment of sound per application. Each application using GStreamer can benefit from this project without any intrusive patch. Other applications should implement the D-Bus interface proposed with GSmartMix to be seen by the smart manager.
JackMaster is a master-mixer for jackd that (unlike jackeq) works like a real console, with a simple fader -> subgroup -> master routing. Unlike jackmix, it has faders instead of knobs. It features low CPU usage, optional session management with LASH, and optional fader automation with the ALSA sequencer.
OpenAL Soft is a cross-platform implementation of the OpenAL 3D audio API. It's based on the open-sourced Windows version from openal.org. It provides capabilities for playing audio in a virtual 3d environment. Distance attenuation, doppler shift, and directional sound emitters are among the features handled by the API. More advanced effects, including air absorption, low-pass filters, and reverb, are available through the EFX extension. It also facilitates streaming audio, multi-channel buffers, and audio capture.
SDL_sound is a library that handles the decoding of several popular sound file formats such as .WAV and .MP3. Designed to make the task of sound playback easier, SDL_sound accepts files or other input through an abstraction layer and returns the decoded waveform. SDL_sound can decode a whole sound file and hand back a single pointer to the waveform, or SDL_sound can process sound data in programmer-specified blocks when resource constraints are a concern. SDL_sound can also handle sample rate, audio format, and channel conversion on-the-fly.
SDLucid is a C++ wrapper library for the SDL media library. It aims to not only be a wrapper, but to also offer a cleaner interface than the original SDL, as well as increased functionality. This additional functionality includes fonts, PNG loading, graphical primitives, built-in mixing, mod playing, and MP3 decoding. SDLucid follows naming conventions, approximating those of the Standard Template Library.