A free multi-track audio editor and recorder
Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages. The version currently hosted here is 2.1.0 (March 2015). More recent versions than this are available from http://www.audacityteam.org/download/ . Audacity is free software, developed by a group of volunteers and distributed under the GNU General Public License (GPL). Programs like Audacity are also called open source software, because their source code is available for anyone to study or use. There are thousands of other free and open source programs, including the Firefox web browser, the LibreOffice or Apache OpenOffice office suites and entire Linux-based operating systems such as Ubuntu
Audio converter and CD ripper for various formats
fre:ac is a free audio converter and CD ripper for various formats and encoders. It features MP3, MP4/M4A, WMA, Ogg Vorbis, FLAC, AAC, and Bonk format support, integrates freedb/CDDB, CDText and ID3v2 tagging and is available in several languages.
Streams many media formats with minimal configuration
Universal Media Server is a DLNA-compliant UPnP Media Server Universal Media Server supports all major operating systems, with versions for Windows, Linux and Mac OS X. The program streams or transcodes many different media formats with little or no configuration. UMS is powered by MEncoder, FFmpeg, tsMuxeR, AviSynth, MediaInfo and more, which combine to offer support for a wide range of media formats Check out the list of media renderers here: http://www.universalmediaserver.com/about/
Low-latency, high quality voice chat for gamers
Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. It includes game linking, so voice from other players comes from the direction of their characters, and has echo cancellation so the sound from your loudspeakers won't be audible to other players.
Free music notation & composition software
MuseScore is the leading free & open source music notation software for Windows, Mac and Linux. It is easy to use and makes beautiful sheet music. MuseScore is often praised as a cost effective alternative for Sibelius and Finale. Support MuseScore at http://musescore.org/en/donate Like MuseScore on Facebook: http://facebook.com/musescore
Free church worship presentation software
Open Source Worship Presentation Software. This project has moved to Launchpad: https://launchpad.net/openlp
Cross-platform player and audio manager
aTunes is a powerful, full-featured, cross-platform player and manager, with support for online radios, podcasts and CD ripping.
Transana is a cross-platform tool for the transcription and qualitative analysis of audio and video data. It also provides the ability to identify and organize analytically interesting portions of videos, as well as attach keywords to those video clips.
LinPHA is an easy to use, multilingual, flexible photo/image archive/album/gallery written in PHP. It uses a SQL database to store information about your pictures. It comes with a HTML based installer, so you don't need experience in setting up SQL
Merge and Translate Subtitles
DualSub is a tool which allows you to merge two SRT subtitles in a single file. The idea of using merged subtitles (let's call them dual subtitles) is to watch movies/series in original version with two sets of subtitles. Why is this useful? Dual subtitles can be used to learn a second language while watching movies/series. The typical case is when your mother tongue is not English but you want to watch movies/series in English. Then you have several options: 1. Learn English ; 2. Watch it with subtitles ; 3. Watch it translated to your mother language ; 4. Do not watch it. DualSub is a tool for those people between options 1 and 2. If your English is not perfect, you usually face to idioms, words and expression you do not know. By watching movies/series with dual subtitles (i.e. its original subtitles plus a translation) you will never be in doubt anymore of those expressions you do not understand, since the translation is instantaneous.
A media player software and entertainment system application framework
XBMC Media Center is a free cross-platform media player software and entertainment system application framework for Linux, Mac, and Windows. XBMC is capable of playing back and streaming all popular video, audio, and picture formats out-of-the-box.
An easy way to enjoy your favorite multimedia collection
MPlayerX is armed by FFmpeg and MPlayer, which means it could handle almost any media format in the world for you and no extra plug-ins or codec packages are required. Just drop anything to it, MPlayerX will give you a clear and smooth playback.