sndio ~ Unix Audio & MIDI Server


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 are part of the project goals.

sndio.org

terminatorX ~ Realtime Audio Synthesizer


 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.

terminatorx.org

LAoE ~ Multilayer Java Audio Editor


LAoE means Layer-based Audio Editor, and it is a rich featured graphical audio sample-editor, based on multi-layers, floating-point samples, volume-masks, variable selection-intensity, and many plugins suitable to manipulate sound, such as filtering, retouching, resampling, graphical spectrogram editing by brushes and rectangles, sample-curve editing by freehand-pen and spline and other interpolation curves, effects like reverb, echo, compress, expand, pitch-shift, time-stretch, and much more… And it is free of charge, under GPL license!

www.oli4.ch/laoe/home
sourceforge.net/projects/laoe

DGuitar ~ Guitar Pro File Player & Viewer


DGuitar is a Guitar Pro (*.GP4,*.GP3,GTP) viewer and player that works under Linux, MacOs, Solaris, BSD or Windows or any other Operational System that has Java Runtime Environment 1.4 or later installed.

dguitar.sourceforge.net

GLAME ~ GNU / Linux Audio Mechanics


Welcome to the wonderful world of GLAME, short for GNU/Linux Audio Mechanics! The project aims to present you with a powerful, fast, stable and easily extensible sound editor for Linux and compatible systems. And best of all, it’s GPLed!

glame.sourceforge.net

FFmpeg ~ Open Source Audio Visual Toolset


A complete, cross-platform solution to record, convert and stream audio and video. FFmpeg is the leading multimedia framework, able to decodeencodetranscodemuxdemuxstreamfilter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge. No matter if they were designed by some standards committee, the community or a corporation. It is also highly portable: FFmpeg compiles, runs, and passes our testing infrastructure FATE across Linux, Mac OS X, Microsoft Windows, the BSDs, Solaris, etc. under a wide variety of build environments, machine architectures, and configurations.

ffmpeg.org

Resources:

en.wikipedia.org/wiki/FFmpeg

github.com/FFmpeg/FFmpeg

sourceforge.net/projects/ffmpeg-windows-builds

sourceforge.net/projects/ffmpeg-batch

sourceforge.net/projects/ffmpeg-ios

opensource.com/article/17/6/ffmpeg-convert-media-file-formats

MIDI Router ~ Anywhere To Anywhere


Features:
  • Route anywhere to anywhere.
  • Create virtual port.
  • Route from WebMidiJs client to server and back.
  • Route from server to server.
  • All routing in Real Time with no latency.
  • Route from one event type to another. (cc to pitch wheel)
  • Route to/from 14bit CC.
  • Monitor midi input.
  • Build Custom controls to send CC/Program Change.
  • Custom Program Change dropdown..
  • Transpose / Harmonize.
  • Create presets, controlled by any midi event.

Client git (vuejs, typescript, electron):
github.com/shemeshg/midi-router-client
Server git (C++, Qt webchannel):
github.com/shemeshg/RtMidiWrap

Online client:
shemeshg.github.io/midirouter-online/#/

NorQualizer ~ Automatic Normalizer & EQ


NorQualizer is a smart audio equalizer/normalizer which corrects audio files to get them all similar in terms of bandwidth and volume level. Especially useful for preparing audio CDs with files from different sources.

Features:
  • Extract audio from multimedia files
  • Automatically normalize audio
  • Automatically equalize audio
  • Ideal for creating music albums

sourceforge.net/projects/norqualizer/

meterec ~ Console Multitrack Recorder


meterec works as a basic multitrack tape recorder. The aim of this software is to minimise the interactions of the users with the computer and allow them to focus on their instrumental performances. For this reason meterec’s features are minimal. If you screw one take, start it over again! Rather than learning how to use a specific software to correct what you screw up, meterec forces you to learn and master your instrument. The good news is that previous takes are kept in history and if in the end, the first one was the best you could play, you can choose it in your final mix.

http://meterec.sourceforge.net/

https://sourceforge.net/projects/meterec/