AudioVideoEditing

Aegisub

A free, cross-platform open source tool for creating and modifying subtitles

Visiona

Ciano

A multimedia file converter

Visiona

EasyTAG

Edit audio file metadata

Visiona

Gaupol

Editor for text-based subtitles

Visiona

Gnome Subtitles

Video subtitling for the GNOME desktop

Visiona

Kdenlive

Video Editor

Visiona

Kid3

Edit audio file metadata

Visiona

Kid3

Edit audio file metadata

Visiona

MKVToolNix

Matroska files creator and tools

Visiona

MediaInfo

Convenient unified display of the most relevant technical and tag data for video and audio files

Visiona

MuseScore

Create, playback, and print sheet music for free

Visiona

MusicBrainz Picard

MusicBrainz's music tagger

Visiona

Pitivi

Create and edit your own movies

Visiona

Shotcut

Video editor

Visiona

Sound Converter

Converts audio files into other formats

Visiona

Subtitle Editor

GTK+3 tool to edit subtitles for GNU/Linux/*BSD

Visiona

Transmageddon Media Transcoder

Easy to use audio and video transcoding application

Visiona

VidCutter

Media Cutter + Joiner

Visiona