Org-Mode

An EMACS PIM app https://orgmode.org/

• notes (outliner)
• ToDo Lists across multiple files
• time-tracking ("clocking")

does not use markdown

• some prefer it to Markdown, even for unstructured text notes.

org-super-links adds backlinks

Android version: Orgzly

org-roam replicates Roam in OrgMode https://www.orgroam.com/

• there's an add-on to improve how backlinks are presented