Maybe Whisper? This github repo: https://github.com/linto-ai/whisper-timestamped

Says thay whispher can do timestamps on speech segments. However, I don't know if that's what you want, since whispher might only be able to do that if it is transcribing the actual audio, rather than editing another text file.

I've never used InqScribe nor any other subtitle tool, but alternativeto.net has a list of alternatives like Kainote or SubtitleEdit: https://alternativeto.net/software/kainote/?license=opensource There's even a short Wikipedia article: https://en.m.wikipedia.org/wiki/Comparison_of_subtitle_editors