Obsidian

Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files. It turns your notes into a rich, interlinked network of ideas—designed to help you think better, write more clearly, and organize complex information effortlessly. At its core, Obsidian is built for people who care deeply about their notes and want full ownership of their data. Your notes live as files on your device, not in the cloud—giving you speed, control, and full offline access. With Obsidian’s graph view, bidirectional links, and backlinks, it becomes easy to connect ideas and build a second brain that mirrors the way you think. Whether you're managing research, writing longform content, keeping a personal journal, or organizing a Zettelkasten system, Obsidian is endlessly customizable. Its powerful plugin ecosystem, themes, and community-built extensions allow you to tailor the app to your exact workflow. Obsidian stays out of your way when you’re writing, but gives you powerful tools when you need them. No account required. No vendor lock-in. Just your ideas, in your control.