Gnome Subtitles – Subtitle editor for Linux
Gnome Subtitles is a free and open source subtitle editor for Linux. Using Gnome Subtitles, you can add subtitles and captions to your video. It comes with build-in video preview, time synchronization, translation support, merge and split subtitle lines, spell checking, edit subtitle headers support, character coding, subtitle format auto-detection and more .It is released under the GNU General Public License.