- Aegisub – Free and open source software. A relatively new editor, focused mostly on typesetting. It works in Windows NT, 2000, XP and Vista, and with limited functionality on Linux, FreeBSD and Mac OS X. Since it has the most extensive and comprehensive manual (which includes tutorials on working with the subtitle format), it also appeals to new users. UTF-8 is properly supported, but beware that not all programs accepting ASS/SSA files can read UTF-8. Unlike SubStation Alpha, it has a video bar and not just an audio bar for presentation of the video clip.
- VisualSubSync – Freeware subtitling tool with SRT/SSA/ASS support for Windows.
- subtitleeditor – A tool to edit subtitles for GNU/Linux. (ASS, SSA, SubRip, MicroDVD, MPL2, MPsub, SubViewer 2.0, plain-text, and Adobe Encore DVD formats)
- Sabbu – Free and open source software, hosted at SourceForge. An advanced SSA/ASS editor, focused mostly on timing. It runs in Windows and Linux. This program is a suitable replacement for the original Substation Alpha, as it is basically a more modern version of it. No longer developed.
- Sub Station Alpha tool – Freeware, the original tool, which is very outdated and no longer developed, but still a favorite of some.
- Subtitle Workshop – Freeware. It is not advised because it is not a fully dedicated SSA/ASS editor, because it doesn’t follow the strict rules about SSA subtitles, and it erases any style put in with another program. However, unlike SubStation Alpha it has a video bar instead of an audio bar for presentation of the video clip.
- Subtitle Processor – Free and open source software, hosted at SourceForge. It is feature rich general subtitle editor with good SSA/ASS support. Unicode is supported from version 7.7, UTF-8 is preferred, other encodings are internally converted to UTF-8.
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