Obsidian

Obsidian is a powerful knowledge management and note-taking application that functions as your personal second brain. Built on markdown files stored locally on your device, Obsidian creates a network of interconnected notes through bidirectional linking, enabling you to discover relationships between ideas and build a lasting knowledge base. Unlike cloud-first competitors, Obsidian keeps your data under your control with local-first storage, extensive plugin ecosystem, and complete customization through CSS and JavaScript. The application supports graphs visualizing connections between notes, split views, embedded content, task management, and publishing to the web. Whether you're a researcher building a literature database, a writer organizing chapters, a student taking class notes, or a professional managing projects, Obsidian adapts to your workflow and grows more valuable as your knowledge base expands over time.