Aegisub
Create and edit subtitles for film and videos.
Aliki (with ALSA support)
Measurement tool for Impulse Responses
Aliki (with JACK support)
Measurement tool for Impulse Responses
Audacity
Record and edit audio files
DVBcut
Trim and cut video MPEG2 transport streams into multiple export formats
EasyTAG
Edit audio file metadata
Flowblade Movie Editor
Edit media to create movies

Gmerlin KBD
Configure the Gmerlin keyboard daemon
Gnac
Audio converter for GNOME

Gnome Subtitles
Video subtitling for the GNOME desktop

Kdenlive
Nonlinear video editor by KDE
Kid3-qt
Edit audio file metadata
Kid3
Edit audio file metadata
Kino
Edit DV video
Kwave Sound Editor
A sound editor by KDE

LiVES
A video editor and VJ program

LongoMatch
Sports video analysis tool for coaches
MediaInfo
Supplies technical and tag information about a video or audio file

mhWaveEdit
Record, play, edit and convert sound files

MP3 Diags
MP3 Diags - diagnosis and repair tool
Mp3splt-gtk audio splitter
Split mp3 and ogg files without decoding
MuseScore
WYSIWYG Music score typesetter

OpenShot Video Editor
Create and edit amazing videos and movies

Petri-Foo
Sound Sampler

MusicBrainz Picard
Tag your music with the next generation MusicBrainz tagger

Pitivi
Create and edit your own movies
Poe
Vorbis comment editor
ProjectX
A video editing and demultiplexing tool
QMidiArp
Arpeggiator-Sequencer-LFO

Qmidiroute
MIDI Router and Processor for ALSA
ShowQ
MIDI controllable audio player
Songwrite
guitar tablature editor and player
Stopmotion
Program to create stop-motion animations
Subtitle Editor
A subtitle editor based on GStreamer and Gtk+
Audio Tag Tool
MP3 and Ogg Vorbis tag editor

themonospot
themonospot - extract information from avi or mkv files

WinFF
GUI for ffmpeg or avconv
XCFA
X Convert File Audio. Programme pour convertir les fichiers audio.
Ardour 5
Multitrack hard disk recorder

Ex Falso
Edit tags in your audio files
flowblade
Edit media to create movies
MP3info
Utility for MP3 information and tag modification
Hydrogen Drum Machine
Create drum sequences

Gtk Wave Cleaner
Removes noise from audio recordings e.g. of scratchy vinyl records