Subtitle Edit 3.6 is now out
https://github.com/SubtitleEdit/subtitleedit
SE is an open source (C#) subtitle editor with main focus on creating/editing/sync'ing/adjusting/fixing subtitles, but SE can also
import and ocr vobsub and blu-ray image based subtitles (even from matroska/mp4 files), and DVB sub + teletext from .ts files.
SE supports
300+ subtitle formats - let me know if you need more
Can create/edit blu-ray sup and bdn xml files.
Available for Windows and Linux