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Re:Notion – All-in-one workspace for notes, tasks, wikis, an... by SirensOfTitan on Monday January 14, 2019 @01:30PM (#18905129)
Emacs with org mode, helm, and projectile as a starting point would hit all of your asks (although org syntax has differences from markdown, it's still quite intuitive).

I use org mode for: my tasks (gtd style), food log (using org columns), notes (easy export to any other format), habits. Alongside beorg for iOS for quick capturing on the go, I cannot imagine I would be any happier elsewhere.

Re:Notion – All-in-one workspace for notes, tasks, wikis, an... by mickael-kerjean on Monday January 14, 2019 @06:00PM (#18907388)
Same here, org-mode is going nowhere, it's one of those things that just works. From wikis, todos, document authoring, agendas, code notebook, ... On mobile, there's a few options, I made one, a web app called filestash: https://demo.filestash.app/s/hn . It has a lot of the org mode candies: agenda, todos, and the real org-mode exporters: HTML, PDF, Markdown, TXT, Latex, iCal, ODT and even beamer
Re:Notion – All-in-one workspace for notes, tasks, wikis, an... by azureus on Tuesday January 15, 2019 @06:54AM (#18910517)
And literate programming too with Babel!
Re:Notion – All-in-one workspace for notes, tasks, wikis, an... by gglitch on Monday January 14, 2019 @02:24PM (#18905618)
Org-mode, Helm, and Projectile as a "starting point," is pretty steep. Org alone probably covers the bases.