Obsidian

Obsidian is a Markdown-based note-taking and knowledge management application that stores notes as plain text files on your local device. It emphasizes bidirectional linking, backlinking, and a visual graph view to help users connect ideas and build a personal knowledge base.

The app is highly extensible via community and official plugins, themes, and custom workflows, and offers optional paid services (Sync and Publish) for cloud synchronization and web publishing. It is popular among research...