Jubler is a free and open-source utility for editing subtitle files. It can perform a variety of tasks on text-based subtitle files and supports conversion between various different formats, correcting subtitles and creating new subtitles.
Editing subtitles with Jubler is a cinch. It can perform multiple different tasks: splitting subtitle files, synchorization, copying and pasting, a powerful search and replace function, time shifting, recoding and time-fixing.
Version 5.1 is a freeware program which does not have restrictions and it's free so it doesn't cost anything.
Virus and Malware Tests: The program has been tested with several antivirus applications and has tested clean of viruses, malware or trojans.