AudioVideoEditing

Aegisub

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

Vista

Ciano

A multimedia file converter

Vista

EasyTAG

Edit audio file metadata

Vista

Gaupol

Editor for text-based subtitles

Vista

Gnome Subtitles

Video subtitling for the GNOME desktop

Vista

Kdenlive

Video Editor

Vista

Kid3

Edit audio file metadata

Vista

Kid3

Edit audio file metadata

Vista

MKVToolNix

Matroska files creator and tools

Vista

MediaInfo

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

Vista

MuseScore

Create, playback, and print sheet music for free

Vista

MusicBrainz Picard

MusicBrainz's music tagger

Vista

Pitivi

Create and edit your own movies

Vista

Shotcut

Video editor

Vista

Sound Converter

Converts audio files into other formats

Vista

Subtitle Editor

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

Vista

Transmageddon Media Transcoder

Easy to use audio and video transcoding application

Vista

VidCutter

Media Cutter + Joiner

Vista