Further down the page there's a mention of an OSS equivalent ("Outline"): https:...

		justinclift on Jan 14, 2019 \| parent \| context \| favorite \| on: Notion – All-in-one workspace for notes, tasks, wi... Further down the page there's a mention of an OSS equivalent ("Outline"): https://news.ycombinator.com/item?id=18906118 Haven't tried it out personally (only support signing in from Slack/Google), but it might be your kind of thing. :)