Obsidian

Obsidian is a note-taking and knowledge management app that uses plain text files to create a network of connected and interlinked notes. The app allows you to create and organize notes, connect ideas, and build a personal knowledge base that you can reference and use to generate new insights....
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Obsidian's key feature is its ability to use backlinking to connect notes. This means that whenever you mention or link to another note in your text, Obsidian will automatically create a link to that note, allowing you to easily navigate and explore related ideas. In addition, Obsidian offers a range of other features, such as the ability to insert images, tables, and code blocks, as well as support for plugins and themes to customize and extend the app's functionality.

Obsidian is ideal for people who want to take notes and manage their knowledge in a robust and flexible way. It can be used for everything from academic research and writing to personal journaling and brainstorming.