LilyPond is a text-based music engraver; it is more similar to a programming language than a graphical score editing program.

REAPER is an application that lets you record, arrange, edit, and render multi-track waveform audio. The last freeware version also available.

Virtual MIDI Piano Keyboard (VMPK) is an innovative software application designed using the robust Qt framework and the Drumstick library.

n-Track Studio is an audio & MIDI multitrack recorder that will turn your computer into a full-fledged recording studio.

MuseScore is a free music notation program that offers a cost-effective alternative to commercial programs such as Sibelius and Finale. MuseScore Portable is also available.

MuseScore Portable, via PortableApps, is a free and Open Source music notation program that offers a cost-effective alternative to commercial programs such as Sibelius and Finale. Installer, Linux, Mac, and Android are also available.

Audacity is an Open Source audio application for Windows, macOS, and Linux designed to be a full-featured yet easy-to-use multi-track recording and editing suite.

MultitrackStudio is an audio/MIDI multitrack recording software for Windows.

Notation Player allows you to display MIDI music (.mid, .kar, or .not ) files in sheet music format as the song plays.

Chord Cadenza will help you play and improvise chords while a MIDI file or audio source is played.

Hydrogen is an advanced drum machine with a main goal to bring professional yet simple and intuitive pattern-based drum programming.

OpenChords is a song chord chart management and presentation tool for musicians.

Repetito 3 is a multichannel looper specifically designed for live performances, offering musicians versatile looping capabilities to enhance their live performances.

Cakewalk provides you with everything needed to easily compose complete songs and performances with creative songwriting tools and instruments for free.

Guitar and Bass (G.A.B.) is loaded with useful instructional information geared at having you play like a pro in no time. It supports various instruments/tunings for guitar (6, 7 string), bass (4, 5 string), banjo (4, 5 string), and mandolin are supported by default.

ToneLib GFX is a multi-platform collection of free guitar amps, speaker cabinets and effects allowing for simplified use during recording sessions or while jamming.

ToneLib JAM provides a free comprehensive platform for creating, editing, printing and listening to tablature and sheet music for guitar and other fretted instruments.

JamApp is the perfect audio player for musicians who need to learn complete songs or are just mastering that difficult section.

Jamulus enables musicians to perform real-time jam sessions over the Internet.

Anvil Studio is the perfect piece of multimedia software for when you want to compose or record music with audio equipment, print sheet music, and more.

Audacity is an Open Source audio application designed to be a full-featured, yet easy to use multi-track recording and editing suite.

TuneLite is an app designed to help musicians learn to play songs by slowing or speeding up the tempo, repeating sections, creating loops, and adjusting pitch.

Everyone Piano can play piano notes from your computer's keyboard to allow everyone to learn or improve their piano skills.

Superstring lets musicians create their own lyric videos.

Alternate Chord allows you to exercise your fingers and learn basic guitar chords and scales along with a handy playback option.