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Browse free open source C++ MIDI Software and projects below. Use the toggles on the left to filter open source C++ MIDI Software by OS, license, language, programming language, and project status.

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  • 1
    Hydrogen

    Hydrogen

    An advanced drum machine with pattern-based programming

    Hydrogen is an advanced drum machine for GNU/Linux, Windows and Mac OS X. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.
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    Downloads: 1,671 This Week
    Last Update:
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  • 2
    Fx FloorBoard

    Fx FloorBoard

    Graphical editor software for many Boss and Roland effect & synth unit

    Editors for the BOSS GT-1, 3, 5, 6, 8, Pro, 10, 100, 001 Guitar Multi-Effects Processors, and the BOSS GT-1B,6B,10B Bass Multi-Effects Processors. And for the Katana Amplifier. and various Boss and Roland guitar synths. This software can visually edit parameters via Midi,USB, or Bluetooth(via external device on some units) on the Multi-Effects/Amp/Synth Processor.
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    Downloads: 608 This Week
    Last Update:
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  • 3
    Aria Maestosa
    Aria Maestosa is a midi sequencer/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering score, keyboard, guitar, drum and controller views. Git repository: https://github.com/ariamaestosa/ariamaestosa
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    Downloads: 199 This Week
    Last Update:
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  • 4
    prodatum

    prodatum

    patch editor for the E-MU Proteus 2000 synthesizer family

    A cross-platform patch editor for the E-MU Proteus 2000 sample-based synthesizer family. prodatum is free software.
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    Downloads: 19 This Week
    Last Update:
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  • 5
    Speedy MIDI
    Speedy MIDI is an editor designed for choirs and singers to quickly generate MIDI files for rehearsal.
    Downloads: 10 This Week
    Last Update:
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  • 6
    JD990 Super Editor

    JD990 Super Editor

    VERSION 3.6.1 released 9/25/2025

    CtrlrX based editor for Roland SUPER JD SYNTHESIZER MODULE JD-990
    Downloads: 19 This Week
    Last Update:
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  • 7
    Polymeter

    Polymeter

    Polymeter MIDI sequencer

    Polymeter is a MIDI sequencer for music that's in multiple prime meters (2, 3, 5, 7, 11, etc.) simultaneously. Each track has its own loop length, and when the lengths differ, the tracks "slip" (or shift phase) relative to each other. The resulting interference pattern is sufficiently intricate that variations similar to the embellishments of a live performer can be generated algorithmically. The current project is based on software I developed in the 1990s in order to compose polymeter-based electronic dance music. I'm rescuing from bit rot what might be (for all I know) the world's only sequencer optimized for polymeter. It's a long battle, but it's worth it to be able to compose complex polymeter again.
    Downloads: 14 This Week
    Last Update:
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  • 8
    A win32 MIDI tracker being developed in C++ (MSVC6) using SDL. Interface is almost 1:1 clone of the popular Impulse Tracker DOS tracking software. Multiple out-devices, 64 midi tracks (expandable to 256), .mid export, parameter drawing, 96ppqn, and muc
    Downloads: 14 This Week
    Last Update:
    See Project
  • 9
    FB01 Sound Editor
    A free and open sourced patch editor for the Yamaha FB01 sound module.
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    Downloads: 2 This Week
    Last Update:
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  • 10

    CTRLR panel for Waldorf Microwave XT

    MIDI/Sysex editor for Waldorf Microwave II/XT/XTk

    monstrumWaveXL or (mwaveXL) is a Lua based cross platform application which sends MIDI and sysex data to/from the Waldorf Microwave II/XT/XTk from either standalone mode or as a VST in your favorite DAW. This is not a software emulator of a Waldorf synth, it is an editor for the actual synth thus requires a Waldorf microwave (xt xtk or II) synthesizer.
    Downloads: 3 This Week
    Last Update:
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  • 11
    TSE3 is a powerful third generation open source MIDI sequencer engine written in C++. It is a 'sequencer engine' because it provides the actual driving force elements of a sequencer but provides no form of fancy interface.
    Downloads: 3 This Week
    Last Update:
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  • 12
    Aldrin is an open source modular music sequencer/tracker for the GNU/Linux operating system. Aldrin is currently in beta stage and fully functional. Feel free to try and use it.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 13
    Katmus is an application for manual music transcription. It features a score editor synchronized with a wave file, time stretching, project manager and lots of other features.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14
    CheeseTronic is a set of professional-grade intended audio and music composition apps for unix & compatibles. consists of CheeseTracker(Impulse Tracker Clone), LegaSynth(Old Chip/Keyboard/Synth emu), Shake Tracker(MIDI Tracker), and Chionic (Sampler)
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    BUZZle means Buzz Logic Enhanced and has neither to to with Buzzle.com or the Buzzle-Game. BUZZle is a free (non-commercial) modular music composing and sequencing tool. It is a completely re-written version of the famous Jeskola Buzz.
    Downloads: 0 This Week
    Last Update:
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  • 16
    Dino has moved to Savannah. The URL to the new project page is http://savannah.nongnu.org/projects/dino/
    Downloads: 0 This Week
    Last Update:
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  • 17
    Free Clef is a lightweight notation editor which allows you to quickly write your songs and export them to MusicXML format. It lets you distribute interactive sheet music online, and to use score files with a wide variety of music software.
    Downloads: 0 This Week
    Last Update:
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  • 18
    Gear Grinder

    Gear Grinder

    Editor software for the PRIMOVA GX-2 Gear Shifter device

    Editing software aid for use with the Primova GX-2 Gear Shifter device used with GK type hexaphonic guitar/bass processors. The editor will display and edit the internal functions of the Gear Shifter processor device via a USB port (serial over USB). Link to hardware unit site: https://www.primovasound.com/products/gx2/index.php/
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    JVTool is a graphical editing tool for Roland JV series keyboards. It is able to retrieve/send patches from/to the keyboard, as well as save/read them to/from files. It also provides a full-featured graphical environement to edit patches easily.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    King-pro means "King is Not Guitar Pro". King-pro is a multitrack tablature editor for Linux/Win/MacOS.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Korale aims to be an open source alternative to the popular "Sibelius" sheet music notation software. It will be written portably and flexibly, and will use as intuitive an interface as we can design.
    Downloads: 0 This Week
    Last Update:
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  • 23
    Software to allow hardsid card to act as a MIDI instrument running on a Linux platform. This project will use the existing hardsid driver for Linux (http://sourceforge.net/projects/hardsid). See also www.hardsid.com.
    Downloads: 0 This Week
    Last Update:
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  • 24
    MC (Music Composer) will be a full digital home studio. It has a step-sequencer/piano roll, sampler, sound/midi recording/editing, full automation and full VST, LADSPA, JACK, REWIRE support (client+host). Includes top-notch VST plugins (the DGSS, Rev3D..)
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Audio application emphasizing on orchestral music composition and film scoring.
    Downloads: 0 This Week
    Last Update:
    See Project
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