Fig2dev is a set of tools for creating TeX documents with graphics which are portable, in the sense that they can be printed in a wide variety of environments.

Xfig is an interactive drawing tool which runs under X Window System. In xfig, figures may be drawn using objects such as circles, boxes, lines, spline curves, text, etc. It is also possible to import images in formats such as GIF, JPEG, EPSF (PostScript), etc. Those objects can be created, deleted, moved or modified. Attributes such as colors or line styles can be selected in various ways. For text, 35 fonts are available.

Opus is a royalty-free, highly versatile audio codec. Opus-tools provide command line utilities for creating, inspecting and decoding .opus files.

RNNoise is a noise suppression library based on a recurrent neural network. The algorithm is described in Jean-Marc Valin's paper A Hybrid DSP/Deep Learning Approach to Real-Time Full-Band Speech Enhancement.

The opusfile library provides seeking, decode, and playback of Opus streams in the Ogg container (.opus files) including over http(s) on posix and windows systems.

FLAC stands for Free Lossless Audio Codec, an audio format that is lossless, meaning that audio is compressed in FLAC without any loss in quality.

SpeexDSP is a DSP (Digital Signal Processing) library based on work from the speex codec.

Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. It is standardized by the Internet Engineering Task Force (IETF) as RFC 6716 which incorporated technology from Skype's SILK codec and Xiph.Org's CELT codec.

Icecast is a streaming media server which currently supports Ogg (Vorbis and Theora), Opus, WebM and MP3 audio streams. It can be used to create an Internet radio station or a privately running jukebox and many things in between.

Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms. It currently supports:

1. Null output (handy for testing without a sound device),

2. WAV files,

3. AU files,

4. RAW files,

5. OSS (Open Sound System, used on Linux and FreeBSD),

6. ALSA (Advanced Linux Sound Architecture),

7. aRts (Analog RealTime Synth, used by KDE),

8. PulseAudio (next generation GNOME sound server),

9. esd (EsounD or Enlightened Sound Daemon),

10. Mac OS X,

11. Windows (98 and later),

12. AIX,

13. Sun/NetBSD/OpenBSD,

14. IRIX,

15. NAS (Network Audio Server),

16. RoarAudio (Modern, multi-OS, networked Sound System),

17. OpenBSD's sndio.

GNU Speex is a patent-free audio compression codec specially designed for speech. It is well-adapted to internet applications, such as VoIP. It features compression of different bands in the same bitstream, intensity stereo encoding, and voice activity detection.

Libshout is a library for communicating with and sending data to an icecast server. It handles the socket connection, the timing of the data, and prevents bad data from getting to the icecast server.

The libtheora library implements the ogg theora video format, a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed video format.

Ogg vorbis is a non-proprietary, patent-and-royalty-free, general-purpose compressed audio format.

The package vorbis-tools contains ogg123, an ogg vorbis command line audio player; oggenc, the ogg vorbis encoder; oggdec, a simple, portable command line decoder (to wav and raw); ogginfo, to obtain information (tags, bitrate, length, etc.) about an ogg vorbis file.

The libogg library manipulates the ogg multimedia container format, which encapsulates raw compressed data and allows the interleaving of audio and video data. In addition to encapsulation and interleaving of multiple data streams, ogg provides packet framing, error detection, and periodic timestamps for seeking.

Kate is an overlay codec, originally designed for karaoke and text, that can be multiplixed in Ogg. Text and images can be carried by a Kate stream, and animated. Most of the time, this would be multiplexed with audio/video to carry subtitles, song lyrics (with or without karaoke data), etc., but doesn't have to be.

Series of curves (splines, segments, etc.) may be attached to various properties (text position, font size, etc.) to create animated overlays. This allows scrolling or fading text to be defined. This can even be used to draw arbitrary shapes, so hand drawing can also be represented by a Kate stream.

The libopusenc libraries provide a high-level API for encoding Opus files and streams.

The libvorbis library implements the ogg vorbis audio format, a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel.

Atom is a syndication, API, and archiving format for weblogs and other data. XML::Atom implements the feed format as well as a client for the API.

This module implements a Perl interface to the libxml2 library which provides interfaces for parsing and manipulating XML files. This module allows Perl programmers to make use of the highly capable validating XML parser and the high performance DOM implementation.

This package provides methods to cache compiled XML translators.

XMLStarlet is a set of command line utilities which can be used to transform, query, validate, and edit XML documents. XPath is used to match and extract data, and elements can be added, deleted or modified using XSLT and EXSLT.

HTML-XML-utils provides a number of simple utilities for manipulating and converting HTML and XML files in various ways. The suite consists of the following tools:

• asc2xml convert from UTF-8 to &#nnn; entities

• xml2asc convert from &#nnn; entities to UTF-8

• hxaddid add IDs to selected elements

• hxcite replace bibliographic references by hyperlinks

• hxcite mkbib - expand references and create bibliography

• hxclean apply heuristics to correct an HTML file

• hxcopy copy an HTML file while preserving relative links

• hxcount count elements and attributes in HTML or XML files

• hxextract extract selected elements

• hxincl expand included HTML or XML files

• hxindex create an alphabetically sorted index

• hxmkbib create bibliography from a template

• hxmultitoc create a table of contents for a set of HTML files

• hxname2id move some ID= or NAME= from A elements to their parents

• hxnormalize pretty-print an HTML file

• hxnsxml convert output of hxxmlns back to normal XML

• hxnum number section headings in an HTML file

• hxpipe convert XML to a format easier to parse with Perl or AWK

• hxprintlinks number links and add table of URLs at end of an HTML file

• hxprune remove marked elements from an HTML file

• hxref generate cross-references

• hxselect extract elements that match a (CSS) selector

• hxtoc insert a table of contents in an HTML file

• hxuncdata replace CDATA sections by character entities

• hxunent replace HTML predefined character entities to UTF-8

• hxunpipe convert output of pipe back to XML format

• hxunxmlns replace "global names" by XML Namespace prefixes

• hxwls list links in an HTML file

• hxxmlns replace XML Namespace prefixes by "global names"

Libxml2 is the XML C parser and toolkit developed for the Gnome project (but it is usable outside of the Gnome platform).