ASAP (Another Slight Atari Player) plays and converts 8-bit Atari music (*.sap, *.cmc, *.mpt, *.rmt, *.tmc, …) on modern computers and mobile devices.

asap.sourceforge.net
sourceforge.net/projects/asap
asap.sourceforge.net/web
github.com/epi/asap
ASAP (Another Slight Atari Player) plays and converts 8-bit Atari music (*.sap, *.cmc, *.mpt, *.rmt, *.tmc, …) on modern computers and mobile devices.

asap.sourceforge.net
sourceforge.net/projects/asap
asap.sourceforge.net/web
github.com/epi/asap
Nootka is an application to help learn classical score notation. It helps in understanding the rules of reading and writing scores and helps with developing skills of playing and singing notes.
Simply: users looks at piece of a score, plays it, while Nootka is listening to it, checks and shows was it played well. All in real time.
Features:
- interactive interface to discover the rules of musical notation
- exercises with possibility to create own sets
- accurate method for detecting sung and played sounds
- natural sound of guitars
- clefs (treble, bass and others) and grand staff
- analysis of results
- different kinds of guitars and their tuning

Common Music (CM) is a real-time music composition system implemented in JUCE/C++ and Scheme. It generates musical output via MIDI, OSC, CLM, FOMUS and CSOUND. Its user application is called GRACE (Graphical Real-time Algorithmic Composition Environment)
Features:
- Algorithmic music composition environment
- Runs on Mac, Windows and Linux
- Real time scheduling of musical algorithms
- Two coding languages for designing algorithms: S7 Scheme and SAL (an easy-to-learn alternate)
- MIDI input/output
- CLM/Sndlib audio system built in (Scottstaedt)
- CCRMA digital audio instrument definitions built in (Scottstaedt)
- Open Sound Control input/output
- Metronomes and running algorithm redefinition for live coding
- Data visualization
- Music pattern definitions
- Fomus system built in for computing music notations (Psenicka)
commonmusic.sourceforge.net
sourceforge.net/projects/commonmusic
A multi-platform software synthesiser emulating (somewhat inaccurately) pre-GM MIDI devices such as the Roland MT-32, CM-32L, CM-64 and LAPC-I.

GrandOrgue is a sample based pipe organ simulator. When connected to MIDI keyboards and an audio system, it can accurately simulate the sound of a real pipe organ. This application has builds for Linux, Windows and OSX.
Features:
- Play sample sets
- GUI console

sourceforge.net/projects/ourorgan/
sourceforge.net/p/ourorgan/wiki/Home
Mikmod is a module player and library supporting many formats, including mod, s3m, it, and xm. Originally a player for MS-DOS, MikMod has been ported to other platforms, such as Unix, Macintosh, BeOS, and Java(!!)

Softsqueeze is a music player for your PC that works with the SqueezeCenter software. It complements the Boom, Duet, Transporter, Squeezebox and Slimp3 hardware music players developed by Slim Devices.
Supports synchronization with hardware players and remote streaming over the Internet using ssh tunneling.
Developed in Java, allowing this useful application to work with Windows PCs, OS X and Unix systems.
Emulates most of the digital music players and uses the TCP based slim protocol, allowing use across the Internet and through firewalls / NAT routers.
softsqueeze.sourceforge.net
sourceforge.net/projects/softsqueeze
Spek (IPA: /spɛk/, ‘bacon’ in Dutch) helps to analyse your audio files by showing their spectrogram. Spek is free software available for Unix, Windows and Mac OS X.
Features:
- Supports all popular lossy and lossless audio file formats thanks to the FFmpeg libraries.
- Ultra-fast signal processing, uses multiple threads to further speed up the analysis.
- Shows the codec name and the audio signal parameters.
- Allows to save the spectrogram as an image file.
- Drag-and-drop support; associates with common audio file formats.
- Auto-fitting time, frequency and spectral density rulers.
- Adjustable spectral density range.
- Translated into 19 languages.

spek.cc
github.com/alexkay/spek
A unique desktop music composing application for PC / Mac / Linux / Android with a tracker style interface and a simple modular Java plugin based design allowing rapid improvement and endless expansion.

Powerful music player, multiple libraries, online music & visualizers.
- Supports almost all audio formats through smart conversion to .mp3
- Amazing audio spectrum visualizers
- Audio amplitudes waveform
- Chromium web browser
- Full Dropbox access
- Multiple user accounts
- Configurable via multiple settings
- Advanced tag editor
- File organizer and explorer
- Multiple libraries / playlists support
- System monitor (CPU, RAM)
- Audio effects and filters

Canorus is a free cross-platform music score editor. It supports an unlimited number and length of staffs, polyphony, a MIDI playback of notes, chord markings, lyrics and import/export filters to formats like MIDI, MusicXML, ABC Music, MusiXTeX and LilyPond.

sourceforge.net/projects/canorus
github.com/canorusmusic/canorus
Strawberry is a music player and music collection organizer. It is a fork of Clementine released in 2018 aimed at music collectors, enthusiasts and audiophiles. The name is inspired by the band Strawbs. It’s based on a heavily modified version of Clementine created in 2012 and 2013. Strawberry is written in C++ and Qt 5.
- Play and organize music
- Supports WAV, FLAC, WavPack, DSF, DSDIFF, Ogg Vorbis, Speex, MPC, TrueAudio, AIFF, MP4, MP3, ASF and Monkey’s Audio
- Audio CD playback
- Native desktop notifications
- Playlists in multiple formats
- Advanced audio output and device configuration for bit-perfect playback on Linux
- Edit tags on music files
- Fetch tags from MusicBrainz
- Album cover art from Last.fm, MusicBrainz, Discogs, Tidal and Deezer
- Song lyrics from AudD
- Support for multiple backends
- Audio analyzer
- Audio equalizer
- Transfer music to iPod, iPhone, MTP or other mass-storage USB player
- Streaming support for Tidal, Qobuz and Subsonic
- Scrobbler with support for Last.fm, Libre.fm and ListenBrainz

www.strawbs.org
github.com/jonaski/strawberry
github.com/strawberrymusicplayer
sourceforge.net/projects/strawberry-music-player.mirror
flathub.org/apps/org.strawberrymusicplayer.strawberry