6 open-source alternatives to Obsidian

A markdown editor — and the bridge to your LLM. Local-first, MIT, ~15 MB. Bundled MCP server lets Claude Code / Codex / Cursor drive your vault directly.

Lumina Note - A modern Markdown note-taking app with live preview, bidirectional links, and AI assistant

Kition brings Markdown, DataTable, WhiteBoard, a tool-using AI agent, browser research, and visual workflows into one desktop workspace.

Instant thought capture for macOS. One shortcut, post-it appears, type, close.

Open-source local-first Markdown workspace with wiki, AI editing, and encrypted sync.

A local-first workspace for documents, tasks and meetings on macOS — nested spaces, typed properties, relations and saved views, with transcription, Smart…