[[Concept:Audio]]

Sbcd: 'sbcd' is a curses CD player for GNU/Linux and unix, with an interface based on the ms-dos play utility that came with SoundBlaster 16's. It makes use of SDL for the cd control.

Schism Tracker: Schism Tracker is a tracked music editor that aims to match the look and feel of Impulse Tracker as closely as possible. The player code is based on the Modplug library, so it supports a wide variety of module formats.

Secret Rabbit Code: Secret Rabbit Code (aka libsamplerate) is a Sample Rate Converter for audio. One example of where such a thing would be useful is converting audio from the CD sample rate of 44.1kHz to the 48kHz sample rate used by DAT players. SRC is capable of arbitrary and time varying conversions; from downsampling by a factor of 256 to upsampling by the same factor. Arbitrary in this case means that the ratio of input and output sample rates can be an irrational number. The conversion ratio can also vary with time for speeding up and slowing down effects.

Sfxr: sfxr is a procedural sound generator.

Shn2make: 'shn2make' works with shn audio files and the make program to automate burning CD-Rs and encoding mp3 and ogg files. It looks for an .nfo or .txt file, attempts to interpret the song names, CD listing (and other things according to the most common .nfo file formats), checks MD5 checksums, and, if everything makes sense, outputs the text of a Makefile. The output Makefile fully automates the processing of the set of shn files.

Silicon Empire: Silicon Empire can burn and copy optical discs with help of the cdrtools engine. Because the disc burner of the Silicon Empire builds on the low level layers, Silicon Empire can manage and queue overlapping burn or copy processes.

Simple Multitrack: Simple Multitrack is a set of programs that allow the simultaneous recording of an audio track while listening to a monitor mix of other tracks. It is software for the command line.

SimpleScreenRecorder: SimpleScreenRecorder is a graphical tool that lets you record videos, with or without sound, of your desktop, of your games… It can record in various formats, with different quality settings.

SlimServer: 'SlimServer' provides an elegant and easy to use interface for music playback in many audio formats. It supports Internet radio stations, playlist management, Web access, and an infrared remote control. The music remains on the host computer and streams over the network to any streaming audio client.

SnackAmp: 'SnackAmp' is a multi-platform audio file and streaming music (MP3,Ogg, wav, etc.) player and file organizer suitable for very large music collections. An integrated Web server lets users remote control the client and serve a music collection as streaming audio.

SndBite: 'SndBite' is an audio editor designed for breaking large recordings into smaller components with great efficiency. Its principal intended application is in linguistic research where it is often desirable to put each word or sentence into a separate file before further processing. Features include multiple simultaneous views of the waveform at different resolutions, the ability to position window edges at transitions between sound and silence, automated setting of cut points at zero-crossings, automatic filename generation easily controlled by the user, and optional automatic playback on window motion.

Social: GNU social gives you a powerful social network that is federated. GNU social is a social networking platform. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome. With a little work, status messages can be sent to mobile phones, instant messenger programs (using XMPP), and specially-designed desktop clients that support the Twitter API. GNU social supports an open standard called OStatus that lets users in different networks follow each other. It enables a distributed social network spread all across the Web.

Songanizer: Songanizer is a script to organize a directory containing Ogg and MP3 files. The script accepts a list of directories in which the real Ogg and MP3 files reside. It then reads information like author, album, and genre from the files' ID3 tags and creates parallel directory structures which just contain symbolic links real files. The goal is to create virtual directory structures which give different views of the data without having redundant copies of the files themselves.

Sound Monitor: Sound Monitor is a GNOME panel applet that displays the current volume output of the Esound daemon and (optionally) the Esound status: Off(error), Standby, Ready. It remembers the volume and balance of streams and samples active within esound, and restores those values when a subsequent stream with the same id (name) connects to esound. This lets the user keep volume and balance preferences between sound playback events and sessions. An extra program, esdpvd, is included that lets users save stream volumes between sessions.

Sound Mural: Sound Mural is a command line program that provides an image to sound conversion. This can be called an inverse spectrogram.

SoundConverter: A simple sound converter application for the GNOME environment. It reads anything the GStreamer library can read, and writes WAV, FLAC, MP3, and Ogg Vorbis files.

Sox: SoX converts various formats of computer audio files into other formats. It can also apply various effects to these sound files during the conversion and play and record audio files on several *nix style platforms.

Spchcat: From GitHub: Speech recognition tool to convert audio to text transcripts for GNU/Linux. spchcat is a command-line tool that reads in audio from .WAV files, a microphone, or system audio inputs and converts any speech found into text. It runs locally on your machine, with no web API calls or network activity. It is built on top of Coqui's speech to text library, TensorFlow, KenLM, and data from Mozilla's Common Voice project.

Speex ,: The Speex project aims to build a patent-free voice codec. Unlike codecs like MP3 and Ogg Vorbis, Speex is specially designed for compressing voice at low bit-rates (in the 8-32 kbps/channel range) for applications such as voice over IP (VoIP). Other possible applications include Internet audio streaming at low bit-rate, and archiving of speech data (e.g. voice mail).

Spek: Spek is a GUI-only program for analyzing the spectrum of various audio files. It can help with detecting transcoded files and evaluating their true bit rate. It features support for all popular lossy and lossless audio file formats, fast signal processing, use of multiple threads to further speed up the analysis, display of codec name and audio signal parameters, ability to save the spectrogram as an image file, drag-and-drop support, adjustable spectral density range. auto-fitting time, frequency and spectral density rulers.

Strawberry: Strawberry is a music player and music collection organizer. It's based on Clementine with the Amarok 1.4 look and feel especially aimed at audiophiles. The name is inspired by the band Strawbs.

Strec: 'strec' is a wrapper for dsproxy, LAME, and Real Player 8. It lets you record streams as MP3s.

Submount: The submount removable media handling system automatically mounts and unmounts removable media devices such as CDROMs, DVDs, and floppy drives. It is a two part system, with a small kernel module and a userspace program. It provides the same functionality as supermount, but (hopefully) avoids supermount's stability problems.

Surge: Surge, now called Surge XT, is one of the most popular digital synths used by the free software community. In Surge, each patch contains two scenes which are separate instances of the entire synthesis engine (except effects) that can be used to create layered or split patches. It features 3 oscillators per scene, with 12 versatile oscillator algorithms (Classic, Modern, Wavetable, Window, Sine, FM2, FM3, String, Twist, Alias, S&H Noise and Audio Input), 2 filter units in 8 different configurations and 12 LFO units (6 are per voice and 6 global for the whole scene). Surge was renamed to "Surge XT" after it was entirely rewritten in JUCE.

Swami: Swami (Sampled Waveforms And Musical Instruments) is an application for editing and managing MIDI instruments, such as SoundFont files. A programming API is also provided for integration with other applications.

Sweep: A sound editor for sound samples. It operates on various PCM style files such as .wav, .aiff, and .au. Sweep contains filters and effects as well as multi-level undo and redo. It also allows discontonous selections, multiple views of a sound sample, and piano style-playback.

TCD: TCD is a CD player with an ncurses based interface.

TagLib: 'TagLib' is a library for reading and editing the metadata of several popular audio formats. It supports ID3v1 and ID3v2 for MP3 files, Ogg Vorbis comments and ID3 tags, and Vorbis comments in FLAC files. Tests have shown it to be 6 times faster than id3lib and 3 times faster than libvorbisfile at reading tags (CPU time). It supports Unicode. TagLib offers an abstraction layer that makes it easy to ignore the differences between the different file formats and their implementations. It uses KDE-style programming conventions and C++ by default, but it does not link to either Qt or Glib (it has no external dependancies at all) and does provide Glib-style C bindings (currently for the generic API only).

Tagstoo: Tag folders and files (including multimedia) by dragging the tags on them, you can create tags of various shapes and colors for a more intuitive classification. Precise search possibilities, with various input fields, allowing to add all the necessary tags that you want. For example, in one field you can add the tags cat' and 'white' and in another field you can add the tags 'dog' and 'brown', so the search result will return all white cats and brown dogs. Another more abstract example to show the available searches can be: Searh under folders that have (tag50) or (tag51 + tag52) files that have (tag1 + tag2 + tag7 + tag8) or (tag1 + tag2 + tag6 + tag9) but don't have (tag10) and (tag11). Multimedia files preview in both explorer and searcher results cards. The cover images of epubs also are shown. For images both system's default image viewer and program's new internal viewer can be launched alternatively. Usual file management actions by dragging and dropping or pressing buttons; copy, move, delete, rename. And undo button. It's possible to export/import the tagging data to a file, so data is available in any computer. Features: - Tag Folders and files easily by dragging and dropping tags created from a variety of shapes. - No installation required. Compatible with Windows, GNU/Linux and Mac OS. - Export/import data to a file. - Possible to build up very specific searches. - Various Viewmodes; from lists to cards of different sizes to preview folders and files. - Multimedia file preview in explorer/searcher. Also Epubs. - Integrated image viewer that can be launched alternatively to the system's default viewer. - Tags positions are interchangeable. - If you want a less jazzy interface you have the option to choose a 'grayscale' mode.

Tangerine: Tangerine is a music server. It uses DAAP, the same protocol iTunes uses for sharing. Features include automatic music discovery through Beagle and an easy-to-use configuration tool.

Telegram: Telegram is a multi-platform instant messaging client. It can be used on multiple devices at same time. It supports sending messages, photos, videos and files of any type (doc, zip, mp3, etc) to people who are in the phone contacts and have Telegram. The messages are encrypted using the MTProto protocol developed by Telegram. Its features include self-destructing messages & broadcast groups. This is a desktop client program only; there is currently no free software server program for Telegram.

The Home2Ls: The Home2L [houmtu:l] suite is a framework, library and set of tools for automation in private smart homes. The *Home2L Resources* library allows to integrate and manage sensors, actors or services of any kind efficiently and precisely. Automation rules are typically written in Python. The *Home2L Brownies* subproject allows to integrate cheap 8-bit microcontrollers with do-it-yourself sensor or actor hardware. The *Home2L WallClock* is a lightweight, unobtrusive and portable user interface, including an interactive floor plan view, an MPD-based music player, and a SIP-based phone client for door phones and inter-room communication.

TiMidity: 'TiMidity' is a MIDI to WAVE converter that uses Gravis Ultrasound-compatible patch files and/or AoundFonts to generate digital audio data from General MIDI files. The audio data can be played through any sound device or stored on disk. On a fast machine, music can be played in real time.

TigerVNC: TigerVNC is a high-performance, platform-neutral implementation of VNC (Virtual Network Computing), a client/server application that allows users to launch and interact with graphical applications on remote machines. TigerVNC provides the levels of performance necessary to run 3D and video applications, and it attempts to maintain a common look and feel and re-use components, where possible, across the various platforms that it supports. TigerVNC also provides extensions for advanced authentication methods and TLS encryption.

Tipicalls: Tipicalls is a free meeting room with team management features. It will help you in your everyday life working from home or at the office. It is the best free alternative to the actual platforms in the market with a lot of cool features.

Tox: Tox is a peer-to-peer, encrypted instant messaging and video calling library that provides APIs for clients, including toxcore, toxav, and toxdns API libraries. This is the page about the Tox core, not a particular Tox client. Tox itself is not an instant messaging client.

Tribler: It allows you to watch videos and download content. Tribler aims to combine the ease of Youtube.com with the performance of peer-to-peer. Tribler is backwards compatible with the BitTorrent download protocol. To discover interesting content standard RSS feeds with .torrent links are supported plus the "Tribe protocol" which automatically scans the network for available BitTorrent swarms upon startup. Tribler uses an embedded web browser to access video clips of Youtube.com and Liveleak.com. Other features are "People who like this also like" for recommending related swarms, the ability to make friends, and to donate idle upload capacity to friends. The later can improve download speed by a factor of two on asymmetric Internet links. The fastest way of social file sharing.

Tuner: Tuner is a free internet radio station player using the GTK+ toolkit. It uses the radio-browser.info database to search and access over 27.000 free internet radio (audio & video) stations. It offers the possibility to mark stations as favourites, visit station web sites and displays track information while playing.

Turtle JS: The Javascript version of Turtle Blocks is designed to run in a browser. Turtle Blocks is an activity with a Logo-inspired graphical "turtle" that draws colorful art based on snap-together visual programming elements. Its "low floor" provides an easy entry point for beginners. It also has "high ceiling" programming, graphics, mathematics, and Computer Science features which will challenge the more adventurous student.

UFMOD: It is used to load and play audio files in XM format.

UShare: uShare is a UPnP A/V Media Server for GNU/Linux. It is designed to share multimedia files (audio and video) through the GeeXboX operating system, but can work with any UPnP media renderer or player.

UltraGrid: https://github.com/CESNET/Ultragrid UltraGrid brought by CESNET's Laboratory of Advanced Networking Technologies (Sitola) is a software implementation of high-quality low-latency video and audio transmissions using commodity PC and Mac hardware. Supported resolutions range through HD (1920x1080) up to 4K (4096x2160) with up to 60 frames per second. The high-quality is achieved either by using uncompressed streams or streams with very low compression ratio. End-to-end transmission latency (i.e., all the way from the camera to the display) is about 100ms, but it varies based on camera and capture cards being used. UltraGrid was originally a research project used to demonstrate the possibilities of 10Gbps networks and to study multi-point data distribution in such environments. Recent advances in the field of GPU-accelerated low-latency codecs extend its usability also to Gigabit networks. Nowadays, main application areas are collaborative environments, medical, cinematography and broadcasting applications, as well as various educational activities.

Umix: Umix can adjust soundcard volumes and other features in soundcard mixers. You can control volumes, balances and recording sources flexibly from the command line or with a fullscreen curses user interface. You can can save and load settings from a file. Umix supports multiple mixer devices and all mixer drivers; UIs are dynamically loaded at runtime.

Unified XUL Platform: UXP is a unified application platform for XUL-based applications. It is a hard fork from the Mozilla code repository (mozilla-central) with an ESR-52 fork point. In addition to further development based on the Mozilla upstream code, and selective cherry-picking of directly-applicable patches, it has its own development and holds the base for a maintained platform to be used by XUL applications.

VConnect-STAND: vConnect is a free software singing synthesizer based on WORLD. It was developed at the University of Electro-Communications as part of Cadencii, a piano roll editor compatible with VOCALOID and UTAU.

VLC media player: VLC (initially VideoLAN Client) is a highly portable multimedia player for various audio and video formats (MPEG-2, MPEG-4, H.264, DivX, WebM, WMV, MP3, Ogg, as well as numerous others) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

View3dscene: view3dscene is a viewer for many 3D model formats: - X3D - VRML (1.0 and 2.0, aka VRML 97 - Collada - OpenInventor - 3DS - MD3 - Wavefront OBJ - Videoscape GEO - castle-anim-frames (Castle Game Engine animations) - STL Various navigation modes are available, like Examine, Walk (with gravity), Fly. Collision detection is done. Models can be animated and interactive. Many graphic effects are possible, thanks to using Castle Game Engine underneath. view3dscene may also be used to convert many 3D model formats to X3D (in classic and XML encoding). This package includes also a command-line tovrmlx3d program, that performs the same conversions as view3dscene, but doesn't use X or OpenGL (so it's nice to use in scripts to convert 3D models in batch mode).

Vital: Vital is a modular visual synthesizer with animated controls, filter responses, waveforms, smooth LFOs, oscilloscopes, spectrograms, and more. It is GPU optimized and all animations run at 60 FPS. It is a direct competitor to popular proprietary synth Serum. Vital does not accept any pull requests and has some GPL-compatible restrictions. A community fork of Vital is maintained under the name VItalium.

Vlorb: vlorb is a high quality Audio CD-to-Ogg Vorbis audio file ripper and encoder. It features CDDB support, VorbisGain support, easy configuration, and flexibility.

Volume Normalizer plugin for XMMS: This is a plugin for the MP3 player XMMS, it does volume normalizing so that you will not need to play with the volume knob whenever a song changes. It will set all songs to a fixed level that you set.

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