media player of the VideoLAN project. It allows you to play MPEG, MPEG2, MPEG4, DivX, MOV, WMV, QuickTime, mp3, Ogg/Vorbis files, DVD, VideoCD and multimedia streams from various network sources.
VLC can also be used as a broadcast server to transmit the stream it reads to the network using a broadcast mechanism or via the HTTP protocol.

A free program for recording scores and editing tablature. It also allows you to work with MIDI.

Possibilities:

це програма, яка надає змішаний аудіо / MIDI-секвенсор (відтворення і запис), багатодоріжковий редактор, редагування музики з використанням як рояль н-рол і оцінка позначень, MIDI файл вводу-виводу, LilyPond і Csound файли експорту і т.д.

дозволяє користувачам легко редагувати аудіо / відео проекти, засновані на GStreamer структурі: фіксування аудіо та відео; з'єднання, зміна розмірів, вирізання, застосування ефектів до аудіо / відео джерел.

OpenShot is a very easy-to-use video editor that anyone can understand. A large number of video and audio formats are supported, it is possible to insert transitions and use effects, both video (brightness, contrast, white balance, sepia, old film effect, etc.) and sound. It is possible to insert 3D titles created in Blender. The program easily integrates into the GNOME environment; files can be added to the project by simply dragging and dropping. Exporting files makes it easy to have ready-made profiles.

This is an alternative to commercial programs like FL Studio (R), which allow you to create music on your computer.
It includes creating melodies and beats, synthesizing and mixing sounds, and organizing samples.
You can have fun with the MIDI keyboard and much more, all in a convenient and modern interface.

Hydrogen is an advanced drum machine (step sequencer). The main goal is to create a professional yet simple and intuitive instrument based on drum programming patterns.

This is an easy-to-use, yet powerful audio file editor.
It works with a mixer built into a personal computer system, as well as external audio media.
It provides for the integration of effects: reversal, echo, phase vibrato (phaser), dynamic timbre change (wahwah).
In the editor, you can remove defects from the audio track: hiss, static noise, hum, and also adjust the pitch and tempo.
Works with formats: WAV, Ogg Vorbis, AIFF, AU, MP3, MPEG.

FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has become widely used. FluidSynth itself does not have a graphical user interface, but thanks to its powerful API, several applications use it and it has even found its way into embedded systems and some mobile applications.

Qsynth - GUI for FluidSynth.

MuseScore is a WYSIWYG editor with the ability to quickly enter notes from both the computer keyboard and an external MIDI keyboard. Supports import and export of data in MIDI, MusicXML, LilyPond formats, as well as import of files in MusE, Capella and Band-in-a-Box formats. In addition, the program can export scores to PDF, SVG and PNG files, or to LilyPond documents for further fine-tuning of the score.