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Gnome Subtitles
Gnome Subtitles is a subtitle editor for the GNOME desktop.
It supports the most common text-based subtitle formats, video previewing, timings synchronization and subtitle translation.
Aegisub
Aegisub is a free, cross-platform open source tool for creating and modifying subtitles.
QNapi
A software for downloading and automatic matching subtitles to movies.
Subtitle Editor
Subtitle Editor is a GTK+3 tool to create or edit subtitles for GNU/Linux/*BSD.