Volume.app is a simple and attractive audio volume control program in the dockapp form factor, intended for use with X window managers such as Window Maker, Blackbox, and Afterstep. It differs from many other dockapp mixer programs in that it does not require precise control of the mouse to perform volume adjustments. Its simplistic design is also such that it can only monitor/control one mixer source at a time.
XO Wave is a digital audio workstation designed to meet the needs of audio and video professionals, with a focus on CD mastering and audio for video work. XO Wave provides professional-grade capabilities for manipulating audio, with a familiar and elegant interface. It supports direct recording from any Core Audio device (ALSA/Jack/OSS on Linux), importing and exporting files in a variety of formats (including songs from iTunes playlists), CD burning, multi-track editing, support for many Audio Units, and QuickTime synchronization and export.
XVolume is a simple Xlib volume control that mimics the traditional OSD (on screen display) controls found in various appliances. It is intended to be launched by a shortcut key (eg. one of the "Internet" buttons on your keyboard) and one can then directly adjust the volume by user-defined keys. It was inspired by a similar feature in the Windows driver for a Logitech keyboard. Xvolume is highly configurable and can be tailored for a perfect fit with your window manager.
Xmmix is an audio mixer utility for the X window system using the OSF/Motif interface. It works with the Linux sound driver as well as any UNIX system running the Open Sound System (OSS) driver. Xmmix is user-friendly and has the ability to save/retrieve mixer settings to/from files.
YConsole allows you to monitor and control the Y server in a GUI environment. It also features a set of windows including the YAudio window, YMixer window, and YPlayer window that allow you to control all aspects of the Y server. The YPlayer window allows you to play sound objects and control audio CDs.
Znap is a small network audio mixing daemon. It can load streams supported by the fmod library (Ogg MP3, WAV, etc.) and mix them together. It can be controlled via TCP or XML-RPC. It supports playlists and has an SQLite backend. Future releases will provide scheduling capabilities, making it able to act like radio automation software.