Cliparr is a video clipper for Plex, Jellyfin, and local video. It's a video editor, but its only job is to export a clip from a video. For things like gifs mostly.
When I went to add subtitle tracks to the editor, it bogged down like crazy. So, probably bigger than Cliparr is the new underlying library for the timeline editor. You can read more about that in the post.
Hope you enjoy!