Jubler - Open Source Subitle Editor

Jubler is a tool for editing text-based subtitles. It can be used an an authoring software for new subtitles or as a tool to convert, transform, correct, and refine existing subtitles.

VisualSubSync - Open Source Subtitle Editor

VisualSubSync is a subtitle program using audio waveform representation as its cornerstone. SRT and SSA/ASS subtitle formats are supported. It also provides some tools to help improving the quality of your subtitle.

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Subtitle Creator - Open Source Subtitle Editor

SubtitleCreator allows you to create new subtitles for your DVD's. It has a Wizard interface, advanced synchronization features, DVD preview, and a simple WYSIWYG editor. The latest version even has support for Karaoke.

Gaupol - Open Source Subtitle Editor

Gaupol is an editor for text-based subtitle files. It supports multiple subtitle file formats and provides means of correcting texts and timing subtitles to match video. The user interface is designed with attention to batch processing of multiple documents and convenience of translating.