Kdenlive is a non-linear video editor that supports DV, HDV and many other formats.
Its main features:
✔guides and markers for organizing the editing table
✔copy and paste clips, effects and transitions
✔changes in real time
✔video capture via FireWire and Video4Linux
✔screen capture
✔export to any FFMPEG supported format

VokoscreenNG can be used to record videos from computers screen, webcams, external cameras, etc. This graphical tool can produce educational videos, live recordings of browser navigation, tutorials of installations, record videoconferences, etc. You can capture an alone video or video and sound.

This program can save files in some formats and use some codecs for video and audio:
- Video: x264, openh264, H.264 (Intel GPU), MPEG-2 (Intel GPU) and VP8.
- Audio: vorbis, flac, opus, mp3 and aac.
- File : mkv, webm, avi, mp4 and mov.

KTurtle is an educational programming environment that uses the TurtleScript programming language (inspired by the logo) to make programming as easy and accessible as possible.
The user issues TurtleScript language commands to control the "turtle" as it draws on the canvas, making KTurtle suitable for teaching basic math, geometry, and programming

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.

wxMEdit can edit files in Text/Column/Hex modes, and supports many useful features such as bookmarks, syntax highlighting, conversion to other encodings, word wrapping, word counting, and checking for updates.
It supports all major encodings (UTF8/16/32, ISO-8859-x, CP125x, KOI8, GB18030, Big5, ...) not only in Text/Column mode but also in Hexadecimal (Hex) mode.

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.