I'll chime in with a thumbs up for checkvist.com (no affiliation, happy user). I discovered workflowy.com first but moved across as I was seduced by "try withou

I'll chime in with a thumbs up for checkvist.com (no affiliation, happy user). I discovered workflowy.com first but moved across as I was seduced by "try without registration", the export options - text, markdown, OPML - and the keyboard shortcuts.