Midi Sheet Music is a free program that plays MIDI music files while highlighting both the piano keys and sheet music notes. Works on Windows, Mac OS X, Linux Ubuntu, iPhone / iPad and Android.
midisheetmusic.com
sourceforge.net/projects/midisheetmusic
Featured MIDI File Player for Linux, Windows, and macOS written in C++, and using Qt5 and Drumstick2.
dmidiplayer.sourceforge.io
sourceforge.net/projects/dmidiplayer
sourceforge.net/projects/drumstick
Application which detects musical notes from the microphone. It allows listening to the microphone and play the detected notes to output (in MIDI). Multi-language support.
sourceforge.net/projects/instrumentalmusic
Sndio is a small audio and MIDI framework part of the OpenBSD project and ported to FreeBSD, Linux and NetBSD. It provides a lightweight audio & MIDI server and a fully documented user-space API to access either the server or the hardware directly in a uniform way. Sndio is designed to work for desktop applications, but pays special attention to synchronization mechanisms and reliability required by music applications. Reliability through simplicity is part of the project goals.
sndio.org
A software synthesizer intended for use with DTM software. Supports VSTi plug-in / AU plug-in format. This software is freeware. Functionally, it is modeled after the red synth Clavia NORD LEAD2 and has the following features:
daichilab.sakura.ne.jp/softsynth
This software allows “scratching” on digitally sampled audio data (*.wav, *.au, *.ogg, *.mp3, etc.) the way hip hop DJs scratch on vinyl records. It features multiple turntables, realtime effects (built-in as well as LADSPA plugin effects), a sequencer and MIDI interface – all accessible through an easy-to-use gtk+ GUI. This software is designed to run under Linux, FreeBSD and the like.
Easy to Use ~ A free and easy tool for creating music. Bosca is designed for beginners and takes less than five minutes to learn, and comes with a quick built in tutorial to walk you through everything, step by step.
Scales and Chords ~ Bosca supports lots of different scales and chords, so even if you’ve never composed music before, it’s really easy to get something that sounds good straight away.
Instruments ~ No messing around getting instruments to work! Bosca comes with over a hundred presets, including MIDI and Chiptune instruments.
It’s Free ~ Bosca Ceoil is completely free, and open sourced! Ready to make music? Try it right now in your browser: Online version
boscaceoil.net
github.com/TerryCavanagh/boscaceoil
DrumGizmo is an open source, multichannel, multilayered, cross-platform drum plugin and stand-alone application. It enables you to compose drums in midi and mix them with a multichannel approach. It is comparable to that of mixing a real drumkit that’s has been recorded with a multi mic setup.
SooperLooper is a live looping sampler capable of immediate loop recording, overdubbing, multiplying, reversing and more. It allows for multiple simultaneous multi-channel loops limited only by your computer’s available memory.
The application is a standalone JACK client with an engine controllable via OSC and MIDI. It also includes a GUI which communicates with the engine via OSC (even over a network) for user-friendly control on a desktop. However, this kind of live performance looping tool is most effectively used via hardware (midi foot pedals, etc) and the engine can be run standalone on a computer without a monitor.
SooperLooper is currently supported on Linux and Mac OS X, and any other platforms that support JACK. A Mac OS X Audio Unit version is included which does not require JACK to run.
Beast is a digital synthesizer and music creation system, released as Free Software under the GNU LGPL-2.1+. It has support for Linux Audio Plugins (LADSPA), multi-track editing, unlimited undo, real-time synthesis, MIDI and various audio formats like WAV, AIFF, Vorbis, Soundfont 2, Gus Patch, FLAC and MP3 files, 32bit audio rendering, full duplex support, multi-core audio rendering, SIMD utilisation, precise timing at sample granularity, FFT spectrograms and MIDI automation. The project is translated into a variety of languages.
Editors for the BOSS GT-1, 3, 5, 6, 8, Pro, 10, 100, 001 Guitar Multi-Effects Processors, and the BOSS GT-6B,10B Bass Multi-Effects Processors; and for the Katana modelling amplifier. This software can edit patches via midi on the BOSS Multi-Effects / Amp Processor.
sourceforge.net/projects/fxfloorboard
It’s a VST-compatible host that’s capable of:
While the program started mainly as an aid in understanding and debugging VST plugins, it has evolved into a quite capable program by now which can be really helpful in a keyboard artist’s Live setup.
www.hermannseib.com/english/vsthost.htm
