Obsidian

Obsidian is a note-taking application whose defining property is that the notes are files on your disk. A vault is a folder; a note is a Markdown file; a link between notes is a wiki-style reference in the text. Nothing requires a server, and the folder can be put in any sync service or version control system. That choice has consequences. The application works offline because there is nothing to fetch, the notes remain readable if the application is uninstalled, and a user can edit them in any text editor. It also means the user owns the sync and backup decision rather than inheriting one. On top of the files, Obsidian adds a graph view of links, a canvas for arranging notes spatially, and a plugin system. Plugins are community-authored and can add views, commands, and editor behavior, which is how the application covers workflows it does not ship itself.