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PHAT is a collection of GTK+ widgets geared toward pro-audio apps. The goal is to eliminate duplication of effort and provide some standardization (well, at least for GTK+ apps).

Rage is a video and audio player written with Enlightenment Foundation Libraries with some extra bells and whistles.

BasicDSP is an educational tool that makes it easy to experiment with simple Digital Signal Processing algorithms for audio signals. The input can either be taken from the sound card, or be a locally generated sine wave, white noise or impulse signal. The output is fed to the sound card, as well as to a virtual oscilloscope and spectrum analyzer.

Mediastreamer2 is a powerful and lightweight streaming engine specialized in voice/video telephony applications. It is the library that is responsible for all the receiving and sending of multimedia streams in linphone, including voice/video capture, encoding and decoding, and rendering. Features: * Capture and playback from various platform dependent sound architectures * Send and receive RTP streams * Encode and decode the following audio formats: OPUS, speex, G711, GSM, iLBC, AMR, AMR-WB, G722, SILK, G729, and video formats H263, theora, MPEG4, H264 and VP8 * RTP/AVPF support: RTCP control messages for video error recovery: PLI, SLI, RPSI, FIR * Audio conferencing * Supports SRTP and ZRTP (encryption of voice and video) * Supports any webcam, based on OS's camera API: quicktime, directshow, video4linux, android.camera * Acoustic echo cancellation using the speex echo canceler or webrtc AECm * Read and write .wav files * Optimized rendering of YUV pictures, using OpenGL, DrawDib, X11/Xv * Dual tones generation * Custom tone detector * Audio parametric equalizer * Volume control, automatic gain control * ICE for optimized NAT traversal (RFC5246) to allow peer to peer audio and video connections without media relay server * Adaptive bitrate control algorithm: for automatic adaption of encoder bitrate based on received RTCP feedback * Can use plugins to add new codecs, new sound input/output backends,...

mod_musicindex is an Apache module aimed at being a C implementation of the Perl module Apache::MP3. It allows nice displaying of directories containing several kinds of audio files, including sorting them on various fields, streaming/downloading them, constructing playlists, and searching.

mpgtx was designed with the good old Unix philosophy in mind : do few but do it well and provide end user an austary yet powerfull command line interface. - mpgtx can currently split and join MPEG 1 video files and most MPEG audio files. - mpgtx can fetch detailed informations from MPEG 1 and MPEG 2. - mpgtx can demultiplex MPEG 1 and MPEG 2 files (System layer, Program layer and Transport Layer). - mpgtx can add, remove and edit ID3 tags from mp3 files and rename mp3 files according to their ID3 tags. - DivX ;) is not yet supported, neither is MPEG 4 - splitting and joining of MPEG 2 video files is experimental. (read "will work only in your wildest dreams")

PiTiVi relies on the GStreamer multimedia framework and the accompanying plugins to handle the various medias and their transformation. PiTiVi being a novelty usage of GStreamer, there are some problems with plugins not handling completely/correctly the GStreamer API. These problems are in the process of being corrected. This means that it is not guaranteed that all codecs, containers or effects work properly with PiTiVi.

[ edited excerpt from developer's README ] The MPEG4IP project provides a standards-based system for encoding, streaming, and playing MPEG-4 encoded audio and video. To achieve this we've integrated a number of existing open source packages, and also created some original code to fill in the gaps. Please note this project is intended for developers who are interested in MPEG-4 audio and video, and Internet streaming. It is not intended for end-users. Please read all the legal information in the file "COPYING"! There is also a project web site at http://www.mpeg4ip.net/ that has some general information on MPEG4IP.

Audiopreview is a command-line tool that can play previews of your audio files as well as video files, and even internet media streams. It will play your whole media library without any problem and can also be used as a regular media player.