Obsidian

Local-first knowledge base built on plain Markdown files with bidirectional linking, graph view, and a rich plugin ecosystem.

Obsidian stores notes as local plain Markdown files, giving you full ownership of your data. Bidirectional links, the graph view, and a capable plugin ecosystem turn your notes into an interconnected knowledge network, a true "second brain."

Useful for researchers, writers, and developers who want a durable, portable knowledge base. Use it to build interconnected study notes, document technical concepts with code snippets, and create Zettelkasten-style idea networks.