A youtube-dl fork with additional features and fixes
this can be downloaded and run directly
Flexible video encoding script supporting multiple formats and codecs.
Subtitle Editor
Subtitle Creation Assistant
Adjusts the timing of subtitle files (handles *.srt and *.sub formats)
Full features for Dolphin's right click menu on KDE [4.x|5.x]
Play various formats video and audio file
A tool to convert video from nearly any format to modern codecs
Merge and Translate Subtitles
Managana is a free cross-platform software for digital publication.