[mf_kevintruong]

Great to see a lot of people jump into the field There are alot of note app over three, but not much app to help people on learn/maintain knowledge.

[pps]

Mochi, Remnote, recently Logseq, plus Obsidian and Roam with community plugins. Also Notion with Leitner algo hacked into database. All of these are note-taking apps and have flashcards. I would say it's not that bad :)

[SunghoYahng]

Yes. However, the mainstream of knowledge management tools will be the Note Garden.