Lilypond.org

Makemusic.com

Sibelius.com

Finalemusic.com

Musicaleditor.com

Noteworthysoftware.com

Notation.com

Music-notation-software.com

Notionmusic.com

Goplayalong.com

Drumscore.com

Noteflight.com

Scorio.com

Songsnote.com

Readsheetmusic.info

Subsonic.org

Getsongbird.com

Songbirdnest.com

Sbooth.org

Vorbis.com

Tomahawk-player.org

Clementine-player.org

Hydrogen-music.org

Atunes.org

Jojocms.org

Musopen.org

Gnu.org

Fsf.org

Fluxbb.org

Getmura.com

Librecad.org

Freedos.org

Bonitasoft.org

Pdfreaders.org

Opsound.org

Playonloop.com

Ubuntu.com

Libreoffice.org

Mybb.com

Notepad-plus-plus.org

Ilovefreesoftware.com

Gofree.com

Osalt.com

Reactos.org

Freeos.com

Freesoftwaremagazine.com

Haiku-os.org

Musicreader.net

Sibeliusblog.com

Linuxaudio.org