MuseScore is a free music composition and notation software. It is easy to use and makes beautiful sheet music. MuseScore is often praised as a cost effective alternative for Sibelius and Finale. It is easy and fast note entry with mouse, keyboard or MIDI. It supports playback with integrated sequencer and FluidSynth software synthesizer. 

MuseScore -  MuseScore Free music composition and notation software 

LMMS is a free cross-platform software which allows you to produce music with your computer. This covers creating melodies and beats, synthesizing and mixing sounds and arranging samples. You can have fun with your MIDI keyboard and much more – all in a user-friendly and modern interface. Furthermore LMMS comes with many ready-to-use instrument and effect plugins, presets and samples.
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Its features include:
It provides Song Editor for composing songs, An FX mixer with unlimited FX channels and arbitrary number of effects, Many powerful instrument and effect-plugins out of the box, 

LMMS is a free cross-platform software which allows you to produce music with your computer. This covers creating melodies and beats, synthesizing and mixing sounds and arranging samples. You can have fun with your MIDI keyboard and much more – all in a user-friendly and modern interface. Furthermore LMMS comes with many ready-to-use instrument and effect plugins, presets and samples.

LMMS - Cross-platform music production software

Ubuntu Studio is a multimedia editing/creation flavor of Ubuntu. It's built for the GNU/Linux audio, video, and graphic enthusiast or professional.

Ubuntu Studio - Multimedia toolkit in Ubuntu

Vanilla Music player is a GPLv3 licensed MP3/OGG/FLAC/PCM player for Android.
<ul>
<li>multiple playlist support</li>
<li>grouping by artist, album or genre</li>
<li>plain filesystem browsing</li>
<li><a href="https://en.wikipedia.org/wiki/ReplayGain">ReplayGain</a> support</li>
<li>headset/Bluetooth controls</li>
<li>accelerometer/shake control</li>
<li>cover art support</li>
<li><a href="https://github.com/tgwizard/sls">Simple Last.fm Scrobbler</a> support</li>
</ul>

Vanilla Music player is a GPLv3 licensed MP3/OGG/FLAC/PCM player for Android.

vanilla - Vanilla Music Player for Android

projectM is an OpenGL based advanced music visualization program for Linux, Mac OSX, and Windows. It is backward compatible with all the features of Milkdrop 1.x (and now 2.x), but has many new toys and enhancements.

projectM - Awesome music visualizer

Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.It supports unlimited instrument tracks with volume, mute, solo, pan capabilities.

Hydrogen - Advanced drum machine for Linux

Tomahawk is a music player that fundamentally changes the way music is consumed and shared. Plugin your songs from various sources, Connect your or others computers and friends via Jabber, Google Chat and Twitter. Browse and play their libraries, playlists and stations or just listen along with them. Tomahawk has the knobs, dials and feeds to find it for you. Listen to the latest charts, new releases and create custom radio stations. 

Tomahawk - Social Music Player

CherryMusic is a music streaming server written in python. It helps to stream your own music collection to all your device. It provides support to share playlists with your friends. It has a built-in database, that will index your music. Find your favorite song in an instant. It plays the music inside your PC, smartphone, tablet, toaster or whatever device has a HTML5 compliant browser installed.

CherryMusic - A music streaming server written in python

PortAudio is a free, cross-platform, open-source, audio I/O library.  It lets you write simple audio programs in 'C' or C++ that will compile and run on many platforms. It provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.

PortAudio - Cross-platform Audio I/O Library

Navidrome is an open source web-based music collection server and streamer. It gives you freedom to listen to your music collection from any browser or mobile device. It's like your personal Spotify. It streams virtually any audio format available and handles very large music collections. It is compatible with all Subsonic/Madsonic/Airsonic clients. 



Navidrome Music Server - Modern Music Server and Streamer compatible with Subsonic/Airsonic

RhythmBox is an MP3/OGG player for Linux and the GNOME desktop. It features easy playlist edition, CD-ripping, MP3 walkman support, Audio CD burning and internet radio playback. Its interface is strongly based on Apple's iTunes.

RhythmBox - A Music playing application for GNOME

PlayJoom is a web based audio streaming server. It is written in php and save the data about the audio files like mp3 music in a MySQL database. You can stream your music files, manage covers, and additional informations about the music band, the tracks or the albums. You manage your own playlists with your favorite songs and listen it everywhere in your local network on each device. You can play the audio files direct in the most web browsers on a PC and mobile devices.

PlayJoom - Web based Audio Streaming Server

nuclear is a free music streaming program that pulls content from free sources all over the internet. If you know mps-youtube, this is a similar music player but with a GUI. It's also focusing more on audio. Imagine Spotify which you don't have to pay for and with a bigger library.

nuclear - Popcorn Time for music

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MuseScore - MuseScore Free music composition and notation software