Virtual MIDI controller for Linux, Windows and OSX
VMPK is a virtual MIDI piano keyboard for Linux, Windows and OSX. Based on Qt and Drumstick the program is a MIDI event generator using the computer's alphanumeric keyboard and the mouse. It may be used also to display received MIDI notes.
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
The MIDI sequencer that features a rich understanding of music notation along with basic support for digital audio
Jalmus is a free, open source music education software helping the musicians, especially pianists, to improve their sight-reading. You can train to read music with both exercises on notes or rhythms.
DGuitar is a Guitar Pro (*.GP4,*.GP3,GTP) viewer and player that works under Linux, MacOs, Solaris, BSD, Windows, or any other operating system with Java Runtime 1.4.X. http://DGuitar.sourceforge.net If you are a JAVA developer visit this page https://bitbucket.org/mauriciograciag/dguitar/overview
jOrgan - Java Virtual Organ
ScoreDate is a software to learn music reading and ear training
ScoreDate is your date with the music ! It is an open source software written in Java that helps musicians to learn music reading. It also helps you with ear training. It is suitable for any skill, from beginners to professional users. From slow training to first sight reading.
KGuitar is powerful KDE-based music tabulature editor with support of guitar, drums, classic note scores, MIDI synthesizer output, chord, scales, modes, melody and rhythm construction and analysis tools, lots of tab effects, Guitar Pro files import.