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

I’ve used it quite extensivly, big fan. It asks for further details on objects that have already been mapped, which also reveals things that don’t exist anymore. It turns mapping into a really fun game with currently 163 different quests. The app also regularly asks you to verify opening hours or confirm the existence of certain objects. That being said, I almost always use it in conjunction with a real map editor, to add new stuff I find or to make more complex edits.