Obsidian Overview
Obsidian is a free note-taking and knowledge-management application for Windows, macOS, and Linux that stores your notes as plain Markdown files in a local folder you control, called a vault. Its defining feature is linking: you connect notes with internal links and see those connections visualized in an interactive graph, which suits building a personal knowledge base or 'second brain.' It supports nested folders, tags, backlinks, a large community-plugin ecosystem, and full local control of your data, with optional paid services for encrypted sync and publishing. Because notes are plain files, your data is portable and future-proof. The download is the complete Obsidian setup, so it installs offline without pulling extra files. Canvas boards let you arrange notes spatially, and because everything is local Markdown, it works fully offline and stays readable in any text editor. The official Obsidian download is linked on this page, straight from Obsidian MD.
